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// SPDX-License-Identifier: BUSL-1.1

pragma solidity ^0.8.0;

import "./interfaces/IWSONIC.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./interfaces/IShadowRouter.sol";
import "./lib/TransferHelper.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**************************************************************************************************************************************************
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####                                       ▀                                                                                                      

#### Website: https://snake.finance/

**************************************************************************************************************************************************/

contract ZapperGSnake is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    /* ========== STATE VARIABLES ========== */

    address public constant SHADOW_ROUTER = 0x1D368773735ee1E678950B7A97bcA2CafB330CDc;
    address public constant WSONIC_TOKEN = 0x039e2fB66102314Ce7b64Ce5Ce3E5183bc94aD38;
    address public constant GSNAKE_TOKEN = 0x674a430f531847a6f8976A900f8ace765f896a1b;
    address public constant GSNAKE_LP_TOKEN = 0xb901D7316447C84f4417b8a8268E2822095051E6;

    struct LiquidityPair {
        address _token0;
        address _token1;
        uint256 _amountToken0;
        uint256 _amountToken1;
        uint256 _liqTokenAmt;
    }

    struct FunctionArgs {
        address _LP;
        address _in;
        address _out;
        address _recipient;
        address _routerAddr;
        address _token;
        uint256 _amount;
        
        uint256 _otherAmt;
        uint256 _swapAmt;
    }

    constructor() Ownable() {}

    /* ========== External Functions ========== */

    // @_in - Token we want to throw in
    // @amount - amount of our _in
    // @minAmountOfLp - will be calculated on UI including slippage set by user
    function zapInToken(address _in, uint256 amount, address _recipient, uint256 minAmountOfLp) external payable {
        // From an ERC20 to an LP token, through specified router, going through base asset if necessary
        // 1. check if its authorized token
        require(_in == WSONIC_TOKEN || _in == GSNAKE_TOKEN || _in == address(0), "Only S, wS or GSnake tokens accepted");

        // 2. transfer tokens from sender to this contract
        if (_in != address(0)) {
            IERC20(_in).safeTransferFrom(msg.sender, address(this), amount);
        } else {
            require(msg.value == amount, "Incorrect amount of S sent");
            IWSONIC(WSONIC_TOKEN).deposit{value: amount}();
            _in = WSONIC_TOKEN;
        }

        // 3. approve router to spend tokens
        _approveTokenIfNeeded(_in, SHADOW_ROUTER);

        // 4. swap part of _in for other token
        address other = (_in == WSONIC_TOKEN || _in == address(0)) ? GSNAKE_TOKEN : WSONIC_TOKEN;
        (uint256 amountOfTokenIn, uint256 amountToSwapForOtherToken, uint256 amountOtherForLiquidityEstimate) = getTokenAmountsForLiquidity(_in, amount);

        // 4.3 approve router to spend other token (done)
        _approveTokenIfNeeded(other, SHADOW_ROUTER);

        // 4.4 swap _in for other token
        uint256 otherAmount = _swap(_in, amountToSwapForOtherToken, other, address(this));
        require(otherAmount >= amountOtherForLiquidityEstimate, "amount smaller than estimate");

        // get quoteaddliquidity
        (uint256 amountInToAdd, uint256 amountOtherToAdd, ) = IShadowRouter(SHADOW_ROUTER).quoteAddLiquidity(_in, other, false, amountOfTokenIn, amountOtherForLiquidityEstimate);
        // require(liquidity >= minAmountOfLp, "lp amount too small");

        address recipient = _recipient;

        // 5. add liquidity
        ( , , uint liquidity) = IShadowRouter(SHADOW_ROUTER).addLiquidity(
            _in,
            other,
            false,
            amountInToAdd,
            amountOtherToAdd,
            0, // can be 0 because we already have a require for minAmountOfLp
            0, // can be 0 because we already have a require for minAmountOfLp
            recipient, 
            block.timestamp
        );

        require(liquidity >= minAmountOfLp, "lp amount too small");

        // 6. distribute dust
        retrieveDust(_in, recipient);
        retrieveDust(other, recipient);
    }

    // from an LP token to desired token
    // @in - LP we want to throw in
    // @amount - amount of our LP
    // @out - token we want to get
    function zapOutToToken(uint256 amount, address out, address recipient, uint256 minAmountToken) external {
        require(out == WSONIC_TOKEN || out == GSNAKE_TOKEN || out == address(0), "Only S, wS or GSnake tokens accepted");

        FunctionArgs memory args;
        LiquidityPair memory pair;

        args._amount = amount;
        args._out = out == address(0) ? WSONIC_TOKEN : out;
        args._recipient = recipient;
        
        args._in = GSNAKE_LP_TOKEN;

        IERC20(args._in).safeTransferFrom(msg.sender, address(this), args._amount);
        _approveTokenIfNeeded(args._in, SHADOW_ROUTER);

        pair._token0 = IUniswapV2Pair(args._in).token0();
        pair._token1 = IUniswapV2Pair(args._in).token1();

        _approveTokenIfNeeded(pair._token0, SHADOW_ROUTER);
        _approveTokenIfNeeded(pair._token1, SHADOW_ROUTER);

        (pair._amountToken0, pair._amountToken1) = IShadowRouter(SHADOW_ROUTER).removeLiquidity(pair._token0, pair._token1, false, args._amount, 0, 0, address(this), block.timestamp);
        if (pair._token0 != args._out) {
            pair._amountToken0 = _swap(pair._token0, pair._amountToken0, args._out, address(this));
        }
        if (pair._token1 != args._out) {
            pair._amountToken1 = _swap(pair._token1, pair._amountToken1, args._out, address(this));
        }
        require (pair._amountToken0.add(pair._amountToken1) >= minAmountToken, "amt < minAmountToken");

        if (out == address(0)) {
            IWSONIC(WSONIC_TOKEN).withdraw(pair._amountToken0.add(pair._amountToken1));
            payable(recipient).transfer(pair._amountToken0.add(pair._amountToken1));
        } else {
            IERC20(args._out).safeTransfer(args._recipient, pair._amountToken0.add(pair._amountToken1));
        }
    }
   
    function _swap(address _from, uint amount, address _to, address recipient) private returns (uint) {
        IShadowRouter.route[] memory routes = new IShadowRouter.route[](1);
        routes[0] = IShadowRouter.route({
            from: _from,
            to: _to,
            stable: false
        });

        uint256 minAmountOut = _estimateSwap(_from, amount, _to);

        uint[] memory amounts = IShadowRouter(SHADOW_ROUTER).swapExactTokensForTokens(
            amount,
            minAmountOut, // Use calculated minimum amount instead of 0
            routes,
            recipient,
            block.timestamp
        );

        require(amounts[amounts.length-1] >= minAmountOut, "amount smaller than estimate");
        return amounts[amounts.length - 1];
    }

    // @_in - Token we want to throw in
    // @amount - amount of our _in
    // @out - address of LP we are going to get

    function estimateZapIn(address _in, uint256 amount) public view returns (uint256, uint256, uint256, uint256) {
        address other = (_in == WSONIC_TOKEN || _in == address(0)) ? GSNAKE_TOKEN : WSONIC_TOKEN;
        (uint256 amountOfTokenIn, uint256 amountToSwapForOtherToken, uint256 amountOtherForLiquidityEstimate) = getTokenAmountsForLiquidity(_in, amount);

        if (_in == IUniswapV2Pair(GSNAKE_LP_TOKEN).token0()) {
            (uint256 amountIn, uint256 amountOther, uint256 liquidity) = IShadowRouter(SHADOW_ROUTER).quoteAddLiquidity(_in, other, false, amountOfTokenIn, amountOtherForLiquidityEstimate);
            return (amountIn, amountOther, amountToSwapForOtherToken, liquidity);
        } else {
            (uint256 amountOther, uint256 amountIn, uint256 liquidity) = IShadowRouter(SHADOW_ROUTER).quoteAddLiquidity(other, _in, false, amountOtherForLiquidityEstimate, amountOfTokenIn);
            return (amountOther, amountIn, amountToSwapForOtherToken, liquidity);
        }
    }

    function getTokenAmountsForLiquidity(address _in, uint256 amount) public view returns(uint256, uint256, uint256) {
        uint256 amountOfTokenIn = amount.div(2);
        uint256 amountToSwapForOtherToken = amount.sub(amountOfTokenIn);
        uint256 amountOfOtherTokenForLiquidity = _estimateSwap(_in, amountToSwapForOtherToken, _in == WSONIC_TOKEN ? GSNAKE_TOKEN : WSONIC_TOKEN);

        return (amountOfTokenIn, amountToSwapForOtherToken, amountOfOtherTokenForLiquidity);
    }

     // @ _fromLP - LP we want to throw in
    // @ _to - token we want to get out of our LP
    // @ minAmountToken0, minAmountToken1 - coming from UI (min amount of tokens coming from breaking our LP)
    function estimateZapOut(address _out, uint256 _amount) public view returns (uint256) {
        address token0 = IUniswapV2Pair(GSNAKE_LP_TOKEN).token0();
        address token1 = IUniswapV2Pair(GSNAKE_LP_TOKEN).token1();

        (uint256 _amountToken0, uint256 _amountToken1) = IShadowRouter(SHADOW_ROUTER).quoteRemoveLiquidity(token0, token1, false, _amount);
        if(token0 == _out) { // if sonic, need to swap token1
            return _estimateSwap(token1, _amountToken1, _out).add(_amountToken0);
        } else {
            return _estimateSwap(token0, _amountToken0, _out).add(_amountToken1);
        }
    }
    
    // @_in - token we want to throw in
    // @amount - amount of our _in
    // @out - token we want to get out
    function _estimateSwap(address _in, uint256 amount, address out) public view returns (uint256) {
        IShadowRouter router = IShadowRouter(SHADOW_ROUTER);
        IShadowRouter.route[] memory routes = new IShadowRouter.route[](1);
        routes[0] = IShadowRouter.route({
            from: _in,
            to: out,
            stable: false
        });

        uint256[] memory amounts = router.getAmountsOut(amount, routes);
        return amounts[amounts.length - 1];
    }
    /* ========== Private Functions ========== */

    function _approveTokenIfNeeded(address token, address router) private {
        if (IERC20(token).allowance(address(this), router) == 0) {
            IERC20(token).safeApprove(router, type(uint256).max);
        }
    }

    function retrieveDust(address token, address recipient) private {
        if (token == address(0)) {
            payable(recipient).transfer(address(this).balance);
            return;
        }
        IERC20(token).transfer(recipient, IERC20(token).balanceOf(address(this)));
    }

    /* ========== RESTRICTED FUNCTIONS ========== */
    function withdraw(address token) external onlyOwner {
        if (token == address(0)) {
            payable(owner()).transfer(address(this).balance);
            return;
        }
        IERC20(token).transfer(owner(), IERC20(token).balanceOf(address(this)));
    }

    // add receive function
    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.8.26;

interface IShadowRouter {
    error EXPIRED();
    error IDENTICAL();
    error ZERO_ADDRESS();
    error INSUFFICIENT_AMOUNT();
    error INSUFFICIENT_LIQUIDITY();
    error INSUFFICIENT_OUTPUT_AMOUNT();
    error INVALID_PATH();
    error INSUFFICIENT_B_AMOUNT();
    error INSUFFICIENT_A_AMOUNT();
    error EXCESSIVE_INPUT_AMOUNT();
    error ETH_TRANSFER_FAILED();
    error INVALID_RESERVES();

    struct route {
        /// @dev token from
        address from;
        /// @dev token to
        address to;
        /// @dev is stable route
        bool stable;
    }

    /// @notice sorts the tokens to see what the expected LP output would be for token0 and token1 (A/B)
    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @return token0 address of which becomes token0
    /// @return token1 address of which becomes token1
    function sortTokens(
        address tokenA,
        address tokenB
    ) external pure returns (address token0, address token1);

    /// @notice calculates the CREATE2 address for a pair without making any external calls
    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @param stable if the pair is using the stable curve
    /// @return pair address of the pair
    function pairFor(
        address tokenA,
        address tokenB,
        bool stable
    ) external view returns (address pair);

    /// @notice fetches and sorts the reserves for a pair
    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @param stable if the pair is using the stable curve
    /// @return reserveA get the reserves for tokenA
    /// @return reserveB get the reserves for tokenB
    function getReserves(
        address tokenA,
        address tokenB,
        bool stable
    ) external view returns (uint256 reserveA, uint256 reserveB);

    /// @notice performs chained getAmountOut calculations on any number of pairs
    /// @param amountIn the amount of tokens of routes[0] to swap
    /// @param routes the struct of the hops the swap should take
    /// @return amounts uint array of the amounts out
    function getAmountsOut(
        uint256 amountIn,
        route[] memory routes
    ) external view returns (uint256[] memory amounts);

    /// @notice performs chained getAmountOut calculations on any number of pairs
    /// @param amountIn amount of tokenIn
    /// @param tokenIn address of the token going in
    /// @param tokenOut address of the token coming out
    /// @return amount uint amount out
    /// @return stable if the curve used is stable or not
    function getAmountOut(
        uint256 amountIn,
        address tokenIn,
        address tokenOut
    ) external view returns (uint256 amount, bool stable);

    /// @notice performs calculations to determine the expected state when adding liquidity
    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @param stable if the pair is using the stable curve
    /// @param amountADesired amount of tokenA desired to be added
    /// @param amountBDesired amount of tokenB desired to be added
    /// @return amountA amount of tokenA added
    /// @return amountB amount of tokenB added
    /// @return liquidity liquidity value added
    function quoteAddLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 amountADesired,
        uint256 amountBDesired
    )
        external
        view
        returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @param stable if the pair is using the stable curve
    /// @param liquidity liquidity value to remove
    /// @return amountA amount of tokenA removed
    /// @return amountB amount of tokenB removed
    function quoteRemoveLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 liquidity
    ) external view returns (uint256 amountA, uint256 amountB);

    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @param stable if the pair is using the stable curve
    /// @param amountADesired amount of tokenA desired to be added
    /// @param amountBDesired amount of tokenB desired to be added
    /// @param amountAMin slippage for tokenA calculated from this param
    /// @param amountBMin slippage for tokenB calculated from this param
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amountA amount of tokenA used
    /// @return amountB amount of tokenB used
    /// @return liquidity amount of liquidity minted
    function addLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    /// @param token the address of token
    /// @param stable if the pair is using the stable curve
    /// @param amountTokenDesired desired amount for token
    /// @param amountTokenMin slippage for token
    /// @param amountETHMin minimum amount of ETH added (slippage)
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amountToken amount of the token used
    /// @return amountETH amount of ETH used
    /// @return liquidity amount of liquidity minted
    function addLiquidityETH(
        address token,
        bool stable,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @param stable if the pair is using the stable curve
    /// @param amountADesired amount of tokenA desired to be added
    /// @param amountBDesired amount of tokenB desired to be added
    /// @param amountAMin slippage for tokenA calculated from this param
    /// @param amountBMin slippage for tokenB calculated from this param
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amountA amount of tokenA used
    /// @return amountB amount of tokenB used
    /// @return liquidity amount of liquidity minted
    function addLiquidityAndStake(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);

    /// @notice adds liquidity to a legacy pair using ETH, and stakes it into a gauge on "to's" behalf
    /// @param token the address of token
    /// @param stable if the pair is using the stable curve
    /// @param amountTokenDesired amount of token to be used
    /// @param amountTokenMin slippage of token
    /// @param amountETHMin slippage of ETH
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amountA amount of tokenA used
    /// @return amountB amount of tokenB used
    /// @return liquidity amount of liquidity minted
    function addLiquidityETHAndStake(
        address token,
        bool stable,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountA, uint256 amountB, uint256 liquidity);
    /// @param tokenA the address of tokenA
    /// @param tokenB the address of tokenB
    /// @param stable if the pair is using the stable curve
    /// @param liquidity amount of LP tokens to remove
    /// @param amountAMin slippage of tokenA
    /// @param amountBMin slippage of tokenB
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amountA amount of tokenA used
    /// @return amountB amount of tokenB used
    function removeLiquidity(
        address tokenA,
        address tokenB,
        bool stable,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);
    /// @param token address of the token
    /// @param stable if the pair is using the stable curve
    /// @param liquidity liquidity tokens to remove
    /// @param amountTokenMin slippage of token
    /// @param amountETHMin slippage of ETH
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amountToken amount of token used
    /// @return amountETH amount of ETH used
    function removeLiquidityETH(
        address token,
        bool stable,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);
    /// @param amountIn amount to send ideally
    /// @param amountOutMin slippage of amount out
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amounts amounts returned
    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        route[] calldata routes,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amounts amounts returned
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        route[] memory routes,
        address to,
        uint deadline
    ) external returns (uint256[] memory amounts);
    /// @param amountOutMin slippage of token
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amounts amounts returned
    function swapExactETHForTokens(
        uint256 amountOutMin,
        route[] calldata routes,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);
    /// @param amountOut amount of tokens to get out
    /// @param amountInMax max amount of tokens to put in to achieve amountOut (slippage)
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amounts amounts returned
    function swapTokensForExactETH(
        uint amountOut,
        uint amountInMax,
        route[] calldata routes,
        address to,
        uint deadline
    ) external returns (uint256[] memory amounts);
    /// @param amountIn amount of tokens to swap
    /// @param amountOutMin slippage of token
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amounts amounts returned
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        route[] calldata routes,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);
    /// @param amountOut exact amount out or revert
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    /// @return amounts amounts returned
    function swapETHForExactTokens(
        uint amountOut,
        route[] calldata routes,
        address to,
        uint deadline
    ) external payable returns (uint256[] memory amounts);

    /// @param amountIn token amount to swap
    /// @param amountOutMin slippage of token
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        route[] calldata routes,
        address to,
        uint256 deadline
    ) external;

    /// @param amountOutMin slippage of token
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        route[] calldata routes,
        address to,
        uint256 deadline
    ) external payable;

    /// @param amountIn token amount to swap
    /// @param amountOutMin slippage of token
    /// @param routes the hops the swap should take
    /// @param to the address the liquidity tokens should be minted to
    /// @param deadline timestamp deadline
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        route[] calldata routes,
        address to,
        uint256 deadline
    ) external;

    /// @notice **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens)****
    /// @param token address of the token
    /// @param stable if the swap curve is stable
    /// @param liquidity liquidity value (lp tokens)
    /// @param amountTokenMin slippage of token
    /// @param amountETHMin slippage of ETH
    /// @param to address to send to
    /// @param deadline timestamp deadline
    /// @return amountToken amount of token received
    /// @return amountETH amount of ETH received
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        bool stable,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to);
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

pragma solidity >=0.5.0;

interface IWSONIC {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"GSNAKE_LP_TOKEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GSNAKE_TOKEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SHADOW_ROUTER","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"WSONIC_TOKEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_in","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"out","type":"address"}],"name":"_estimateSwap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_in","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"estimateZapIn","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_out","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"estimateZapOut","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_in","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getTokenAmountsForLiquidity","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_in","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"uint256","name":"minAmountOfLp","type":"uint256"}],"name":"zapInToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"out","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"minAmountToken","type":"uint256"}],"name":"zapOutToToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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