Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.19;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import { TransferHelper } from "./libraries/TransferHelper.sol";

contract DiceGame is Ownable {
    using TransferHelper for address;

    struct GameRound {
        bool fulfilled; // whether the request has been successfully fulfilled
        address user;
        uint256 totalBet;
        uint256 totalWinnings;
        uint256[] betAmts;
        uint256[] diceRollResult;
    }

    uint256 public constant WIN69_MULTIPLIER = 10;
    uint256 public constant CALLBACK_GAS = 200_000;
    uint256 public constant MAX_OPERATOR_GAS = 1_000_000;
    uint256 public constant MAX_NUM_WORDS = 3;
    uint256 public constant DELIMITER = 1e18;
    uint8 public constant decimals = 18;

    string public constant name = "Banana Points";
    string public constant symbol = "BPT";

    uint256 public rollOperatorGas = 600_000;
    uint256 public immutable gamePeriod;
    address public coin;
    address public immutable V3Deployer;
    address public wrappedNative;
    address public immutable gameRngWallet;
    address public immutable rollOperator;

    /// @notice Timestamp when the geme ower
    uint256 public endTime;
    /// @notice Initial rate of tokens per coin
    uint256 public initialTokenRate;
    uint256 public immutable airdropRate;

    uint256 public gameId;
    uint256 public lastFulfilledGameId;

    // The total supply of points in existence
    uint256 public totalSupply;
    // Maps an address to their current balance
    mapping(address => uint256) private userBalances;
    // Maps a game ID to its round information
    mapping(uint256 => GameRound) private gameRounds; /* gameId --> GameRound */
    // Maps an address to their game IDs
    mapping(address => uint256[]) public userGameIds;

    constructor(
        address _gameRngWalletAddress,
        uint _gamePeriod,
        address _V3Deployer,
        address _rollOperator,
        uint256 _airdropRate
    ) {
        gameRngWallet = _gameRngWalletAddress;
        if (_gameRngWalletAddress == address(0) || _V3Deployer == address(0)) revert ZeroValue();
        if (_gamePeriod < 2 hours || _gamePeriod > 180 days) revert GamePeriod();
        gamePeriod = _gamePeriod;
        rollOperator = _rollOperator;
        V3Deployer = _V3Deployer;
        airdropRate = _airdropRate;
        transferOwnership(_V3Deployer);
    }

    event MintPoints(address recipient, uint256 pointsAmount);
    event BurnPoints(address from, uint256 pointsAmount);
    event Redeem(address user, uint256 amount);
    event PurchasePoints(address user, uint256 paymentAmount);
    event Bet(uint256 gameId, address user, uint256 totalBetAmt);
    event BetFailed(address user);
    event ClaimAirDrop(address user, uint256 amount);

    error AmountOfEthSentIsTooSmall(uint256 sent, uint256 minimum);
    error InvalidGameId(uint256 id);
    error InvalidLength();
    error InvaliddiceRollResult(uint256 id);
    error GamePeriod();
    error ZeroValue();
    error NotEnoughCoinBalance(uint256 want, uint256 have);
    error Forbidden();

    // Modifiers
    modifier shouldGameIsNotOver() {
        require(gameNotOver(), "game over");
        _;
    }

    modifier shouldGameIsOver() {
        require(gameOver(), "game is NOT over");
        _;
    }

    /// @notice Receive ETH and forward to `sponsorWallet`.
    receive() external payable {
        (bool success, ) = gameRngWallet.call{ value: msg.value }("");
        require(success);
    }

    /**
     * @notice Starts a new game with specific parameters Airnode details, initial token rate, etc.
     * non-zero initial token rate, and game not already started (initialTokenRate == 0).
     * @param _initialTokenRate The initial rate used within the game logic, set at the start and never changed afterward.
     * @param _coin address of Coin token for this Game
     * @custom:modifier onlyOwner Restricts the function's execution to the contract's owner.
     */
    function startGame(
        uint _initialTokenRate,
        address _coin,
        address _wrappedNative
    ) external payable onlyOwner {
        // Ensure the initial token rate is not already set
        require(initialTokenRate == 0, "o-o");
        if (_coin == address(0)) revert ZeroValue();
        // Initialize the initial token rate and calculate the end time based on the current timestamp
        initialTokenRate = _initialTokenRate;
        coin = _coin;
        wrappedNative = _wrappedNative;
        endTime = block.timestamp + gamePeriod;
        if (msg.value > 0) {
            (bool success, ) = gameRngWallet.call{ value: msg.value }("");
            require(success);
        }
    }

    /// @notice Retrieves the balance of a given account
    /// @dev Returns the current balance stored in `userBalances`
    /// @param account The address of the user whose balance we want to retrieve
    /// @return The balance of the user
    function balanceOf(address account) public view returns (uint256) {
        return userBalances[account];
    }

    /// @notice Retrieves info of particular game id
    /// @param _gameId game number/id
    /// @return gameInfo GameRound struct
    function getGameRoundInfo(uint256 _gameId) public view returns (GameRound memory gameInfo) {
        gameInfo = gameRounds[_gameId];
    }

    /// @notice Retrieves the list of game IDs associated with a given user
    /// @dev Fetches the array of game IDs from `userGameIds` using `.values()`
    /// @param user The address of the user whose game IDs we want to retrieve
    /// @return ids An array of game IDs that the user participated in
    function getUserGameIds(address user) public view returns (uint256[] memory ids) {
        ids = userGameIds[user];
    }

    /// @notice Retrieves the number of games a user has participated in
    /// @dev Calculates the length of the user's game IDs set
    /// @param user The address of the user whose number of games we want to know
    /// @return num The number of games the user has participated in
    function getUserGamesNumber(address user) public view returns (uint256 num) {
        num = userGameIds[user].length;
    }

    // @notice Retrieves the last game information for a given user
    /// @dev Fetches the last game ID and corresponding round info from `userGameIds` and `gameRounds`
    /// @param user The address of the user whose last game information we want to retrieve
    /// @return id The ID of the last game the user participated in
    /// @return round The GameRound struct containing the details of the game round
    function getUserLastGameInfo(
        address user
    ) public view returns (uint256 id, GameRound memory round) {
        uint256 length = userGameIds[user].length;
        if (length > 0) {
            id = userGameIds[user][length - 1];
            round = gameRounds[id];
        }
    }

    /// @notice Determines whether the game is still ongoing or not
    /// @dev Compares the current block timestamp against `endTime`; also ensures that the game has started by requiring `_endTime` to be non-zero
    /// @return Whether the current time is before the game's end time (`true`) or after (`false`)
    function gameNotOver() public view returns (bool) {
        uint256 _endTime = endTime;
        _checkZero(_endTime);
        return block.timestamp < _endTime;
    }

    /**
     * @notice Checks if the game has been concluded based on the time limit.
     * @dev Returns true if the current block timestamp exceeds the end time of the game by 10 minutes.
     *      This implies a grace period of 10 minutes after the official end time before declaring the game over.
     *      The function requires that `endTime` is set and the game has started, otherwise it reverts with an error message.
     *
     * @return A boolean value indicating whether the game is over (true) or not (false).
     */
    function gameOver() public view returns (bool) {
        uint256 _endTime = endTime;
        _checkZero(_endTime);
        return (block.timestamp > _endTime && gameId == lastFulfilledGameId);
    }

    struct GameState {
        uint256 gameId;
        uint256 betNumber;
    }

    /// @dev This function returns the state of games that have not yet been fulfilled.
    /// It constructs an array of `GameState` structures representing each unfulfilled game's
    /// ID and the count of bets placed in that game round.
    /// The function only includes games with IDs greater than `lastFulfilledGameId`.
    /// @return state An array of `GameState` structs for each unfulfilled game.
    function getGameState() public view returns (GameState[] memory state) {
        if (gameId > lastFulfilledGameId) {
            uint256 requests = gameId - lastFulfilledGameId;
            state = new GameState[](requests);
            uint256 index;
            while (lastFulfilledGameId + index < gameId) {
                uint256 id = lastFulfilledGameId + index + 1;
                state[index].gameId = id;
                state[index].betNumber = gameRounds[id].betAmts.length;
                index++;
            }
        }
    }

    /// @notice Allows a user to place a bet on a dice roll(s), record the bet details, and request randomness
    /// @dev Transfers the required ETH to sponsor wallet and creates a new game round with provided bets
    /// @param _betAmts An array of amounts representing individual bets for each roll of the dice
    function bet(uint256[] memory _betAmts) external payable shouldGameIsNotOver {
        // user must send enough native for the callback
        // otherwise the transaction will fail
        uint256 minimumSend = tx.gasprice * CALLBACK_GAS;
        _checkAmount(minimumSend);
        // Transfer the received native to the gameRngWallet wallet to cover the callback transaction costs
        (bool success, ) = gameRngWallet.call{ value: msg.value }("");
        require(success);
        _bet(msg.sender, _betAmts);
    }

    struct OperatorInput {
        address user;
        uint256[] betAmts;
    }
    /// @notice Allows roll operator to place batch bets for different users. Operator must add users to batch who
    ///     have enough wrapped native tokens, have given approval for it, and have fulfilled their last game round
    /// @param _inputs encoded input for array of OperatorInput structs
    function bet(bytes calldata _inputs) external payable shouldGameIsNotOver {
        if (msg.sender != rollOperator) revert();
        OperatorInput[] memory batchInfo = abi.decode(_inputs, (OperatorInput[]));
        uint length = batchInfo.length;
        if (length == 0 || length > 30) revert InvalidLength();
        uint256 minimumSend = tx.gasprice * CALLBACK_GAS * length;
        uint256 gasAmt = tx.gasprice * rollOperatorGas;
        _checkAmount(minimumSend);
        OperatorInput memory info;
        uint successCount;
        for (uint i; i < length; ) {
            info = batchInfo[i];
            try this.processBatchBet(info.user, info.betAmts) {
                unchecked {
                    ++successCount;
                }
            } catch {
                emit BetFailed(info.user);
            }
            unchecked {
                ++i;
            }
        }

        uint refund;
        if (successCount > 0) {
            uint gasRandomizer = (msg.value * successCount) / length;
            refund = msg.value - gasRandomizer;
            (bool success, ) = gameRngWallet.call{ value: gasRandomizer }("");
            require(success);
            (bool result, ) = wrappedNative.call(
                abi.encodeWithSignature(
                    "withdrawTo(address,uint256)",
                    msg.sender,
                    gasAmt * successCount
                )
            );
            require(result, "withdrawTo");
        } else {
            refund = msg.value;
        }
        if (refund > 0) {
            (bool success, ) = msg.sender.call{ value: refund }("");
            require(success);
        }
    }

    function processBatchBet(address _user, uint[] memory _betAmts) external shouldGameIsNotOver {
        if (tx.origin != rollOperator) revert();
        uint gasAmt;
        unchecked {
            gasAmt = tx.gasprice * rollOperatorGas;
        }
        wrappedNative.safeTransferFrom(_user, address(this), gasAmt);
        _bet(_user, _betAmts);
    }

    /// @notice Allows roll operator place bets for users
    /// @param _user Address of certain user
    /// @param _betAmts An array of amounts representing individual bets for each roll of the dice
    function bet(address _user, uint256[] memory _betAmts) external payable shouldGameIsNotOver {
        if (msg.sender != rollOperator) revert();
        // msg.value must be enough to cover randomizer gas spends
        uint256 minimumSend = tx.gasprice * CALLBACK_GAS;
        // take from user gas amount*gas.price
        uint256 gasAmt = tx.gasprice * rollOperatorGas;
        _checkAmount(minimumSend);
        wrappedNative.safeTransferFrom(_user, address(this), gasAmt);
        (bool success, ) = wrappedNative.call(
            abi.encodeWithSignature("withdrawTo(address,uint256)", msg.sender, gasAmt)
        );
        require(success, "withdrawTo");
        // send to randomizer 200_000gas*gas.price for callback
        (bool result, ) = gameRngWallet.call{ value: msg.value }("");
        require(result);
        _bet(_user, _betAmts);
    }

    function _bet(address _user, uint256[] memory betAmts) internal {
        (uint256 id, GameRound memory round) = getUserLastGameInfo(_user);
        require(round.fulfilled || id == 0, "last round not fulfilled");
        // Check if the number of dice rolls is within the permitted range
        uint256 numWords = betAmts.length;
        require(numWords > 0 && numWords <= MAX_NUM_WORDS, "invalid betAmts");
        // Calculate the total bet amount from the array of bets
        uint256 totalBetAmt;
        for (uint i; i < numWords; ) {
            // Each bet amount must be greater than zero
            _checkZero(betAmts[i]);
            unchecked {
                totalBetAmt += betAmts[i];
                ++i;
            }
        }
        // Ensure the user has enough points to cover their total bet
        // It is possible to resend a bid for the same balance,
        // so this check is also added to the callback function
        require(totalBetAmt <= balanceOf(_user), "points are not enough");
        _burnPoints(_user, totalBetAmt);

        unchecked {
            ++gameId;
        }
        uint256 _gameId = gameId;

        // Record the game round details in the contract state
        gameRounds[_gameId] = GameRound({
            fulfilled: false,
            user: _user,
            totalBet: totalBetAmt,
            totalWinnings: 0,
            betAmts: betAmts,
            diceRollResult: new uint256[](betAmts.length)
        });

        // Associate the game ID with the user's address
        userGameIds[_user].push(_gameId);
        emit Bet(_gameId, _user, totalBetAmt);
    }

    struct RandomData {
        uint256 id;
        uint256[] rn;
    }

    /**
     * @notice Fulfills the generation of random words if gas requirement is met
     * @dev Processes each `RandomData` entries until either all are processed or minimum remaining gas is not met
     * @param minRemainingGas The minimum amount of gas that must be left for the function to continue processing
     * @param randomData An array of `RandomData` structs containing the IDs and random number arrays to process
     * Requirements:
     * - Only callable by the `gameRngWallet`.
     * - Will stop processing if the remaining gas is less than `minRemainingGas`.
     * Emits a `RandomWordsFulfilled` event upon successful processing of an entry.
     * Uses the `_fulfillRandomWords` internal function to process each entry.
     */
    function fulfillRandomWords(uint256 minRemainingGas, RandomData[] memory randomData) external {
        require(msg.sender == gameRngWallet, "invalid caller");
        for (uint256 i; i < randomData.length; ) {
            if (gasleft() < minRemainingGas) {
                break;
            }
            _fulfillRandomWords(randomData[i].id, randomData[i].rn);
            unchecked {
                ++i;
            }
        }
    }

    /// @notice Records the result of dice rolls, updates the game round, and handles payouts
    /// @dev Requires the caller to be the designated AirnodeRrp address and checks if the round can be fulfilled
    /// @param _gameId The unique identifier of the game round that the dice roll results correspond to
    /// @param _randomWords The array of random numbers provided by off-chain QRNG service
    /// Using the QRNG service is free, meaning there is no subscription fee to pay.
    /// There is a gas cost incurred on-chain when Airnode places the random number on-chain in response to a request,
    /// which the requester needs to pay for.
    function _fulfillRandomWords(uint256 _gameId, uint256[] memory _randomWords) private {
        unchecked {
            ++lastFulfilledGameId;
        }
        // Retrieve the game round using the _gameId
        GameRound storage round = gameRounds[_gameId];
        uint256 totalBet = round.totalBet;
        if (_gameId != lastFulfilledGameId || totalBet == 0) {
            revert InvalidGameId(_gameId);
        }

        uint256 length = _randomWords.length;
        if (length != round.diceRollResult.length) {
            revert InvaliddiceRollResult(_gameId);
        }
        // Mark the round as fulfilled
        round.fulfilled = true;
        uint256 totalWinnings;

        uint256 bitDice;
        bool double3;
        for (uint i; i < length; ) {
            // Get the dice number between 1 and 6
            uint256 num = (_randomWords[i] % 6) + 1;
            // Calculate winnings based on even dice numbers
            if (num % 2 == 0) {
                totalWinnings += round.betAmts[i] * 2;
            }
            // Special logic for determining 33
            if (num == 3 && !double3 && bitDice & (1 << num) == (1 << num)) {
                double3 = true;
            }
            bitDice |= (1 << num);
            round.diceRollResult[i] = num;
            unchecked {
                ++i;
            }
        }
        // Special logic for determining winnings if the special 69 condition is met
        // or if the special 666 condition is met
        // or if the special repdigit condition is met
        if (length == 3) {
            //Repdigit
            if ((bitDice & (bitDice - 1)) == 0) {
                totalWinnings = 0;
                if (bitDice == 64) {
                    // 666
                    uint256 balance = balanceOf(round.user);
                    if (balance > 0) {
                        _burnPoints(round.user, balance);
                    }
                }
            } else if ((bitDice == 72 && !double3) || bitDice == 112) {
                // 69
                totalWinnings = totalBet * WIN69_MULTIPLIER;
            }
        }
        if (totalWinnings > 0) {
            round.totalWinnings = totalWinnings;
            _mintPoints(round.user, totalWinnings);
        }
    }

    /**
     * @notice Allows users to purchase a specified amount of points.
     * @param desiredAmountOut The exact amount of points the user wants to purchase.
     */
    function purchasePoints(uint256 desiredAmountOut) external shouldGameIsNotOver {
        uint256 paymentAmount = calculatePaymentAmount(desiredAmountOut);
        coin.safeTransferFrom(msg.sender, address(this), paymentAmount);
        _checkZero(desiredAmountOut);
        _mintPoints(msg.sender, desiredAmountOut);
        emit PurchasePoints(msg.sender, paymentAmount);
    }

    /**
     * @notice Calculates the payment amount required for purchasing a specific amount of points.
     * @param desiredPointsAmount The desired amount of points.
     * @return paymentAmount The corresponding amount of payment currency that can be purchased/sold for the specified points.
     */
    function calculatePaymentAmount(
        uint256 desiredPointsAmount
    ) public view returns (uint256 paymentAmount) {
        uint256 tokenRate = initialTokenRate;
        if (tokenRate == 0) revert ZeroValue();
        uint256 intermediate = desiredPointsAmount * DELIMITER;
        paymentAmount = intermediate / tokenRate;
        // Round up only for buying
        if (paymentAmount == 0 || intermediate % tokenRate > 0) {
            paymentAmount += 1;
        }
    }

    /**
     * @notice Calculates the points amount a user receives for a given coin amount.
     * @param paymentAmount Amount of the payment currency (e.g., ETH) used to purchase tokens.
     * @return pointsAmount The resulting amount of tokens that can be purchased for the specified `paymentAmount`.
     */
    function calculatePointsAmount(
        uint256 paymentAmount
    ) public view returns (uint256 pointsAmount) {
        uint256 rate = initialTokenRate;
        if (rate == 0) revert ZeroValue();
        pointsAmount = (paymentAmount * rate) / DELIMITER;
    }

    function sendLiquidity() external shouldGameIsOver onlyOwner returns (uint amount) {
        amount = coin.getBalance();
        coin.safeTransfer(V3Deployer, amount);
    }

    function setOperatorGas(uint256 _operatorGas) external onlyOwner {
        _checkZero(_operatorGas);
        if (_operatorGas > MAX_OPERATOR_GAS) revert();
        rollOperatorGas = _operatorGas;
    }

    /// @notice Redeem points for tokens.
    /// @dev Burns points from the redeemer's balance and mints equivalent tokens.
    ///      Emits a Redeem event upon success.
    ///      Requires the game to be over.
    ///      Requires the Token to have been set and the caller to have a non-zero point balance.
    /// @param signature 65 bytes signature for verify eligibility redeem tokens
    function redeem(bytes calldata signature) external shouldGameIsOver {
        _checkSignature(signature);
        uint256 amount = balanceOf(msg.sender);
        _checkZero(amount);
        _burnPoints(msg.sender, amount);
        (bool success, ) = V3Deployer.call(
            abi.encodeWithSignature("redeem(address,uint256)", msg.sender, amount)
        );
        require(success);
        emit Redeem(msg.sender, amount);
    }

    /// @notice claimAirDrop for certain users.
    /// @dev Burns points from the users balance and mints equivalent coins corresponding to airdropRate.
    ///      Emits a ClaimAirDrop event upon success.
    ///      Requires the game to be over and distibuted
    ///      Requires the Token to have been set and the caller to have a non-zero point balance.
    /// @param signature 65 bytes signature for verify eligibility redeem tokens

    function claimAirDrop(bytes calldata signature) external {
        (bool success, bytes memory response) = V3Deployer.staticcall(
            abi.encodeWithSignature("distributedGames(address)", address(this))
        );
        require(success && response.length == 32);
        require(abi.decode(response, (bool)), "wait for distribution");
        _checkSignature(signature);
        uint256 points = balanceOf(msg.sender);
        _checkZero(points);
        _burnPoints(msg.sender, points);
        uint amount = (points * airdropRate) / DELIMITER;
        require(coin.getBalance() >= amount, "top up coin");
        coin.safeTransfer(msg.sender, amount);
        emit ClaimAirDrop(msg.sender, amount);
    }

    function _checkSignature(bytes calldata signature) private view {
        bytes32 message = _withPrefix(
            keccak256(abi.encodePacked(msg.sender, block.chainid, address(this)))
        );
        require(ECDSA.recover(message, signature) == rollOperator, "invalid signature!");
    }

    function _withPrefix(bytes32 _hash) private pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", _hash));
    }

    /// @notice Mints points and assigns them to a specified account
    /// @dev Increments `userBalances` and `totalSupply` by the given `amount`
    /// @param to The address of the recipient to whom points are to be minted
    /// @param amount The quantity of points to be minted
    function _mintPoints(address to, uint256 amount) private {
        userBalances[to] += amount;
        totalSupply += amount;
        emit MintPoints(to, amount);
    }

    /// @notice Burns points from a specified account's balance
    /// @dev Decrements `userBalances` and `totalSupply` by the given `amount`
    /// @param from The address from which points are to be burned
    /// @param amount The quantity of points to be burned
    function _burnPoints(address from, uint256 amount) private {
        userBalances[from] -= amount;
        totalSupply -= amount;
        emit BurnPoints(from, amount);
    }

    function _checkZero(uint256 amount) private pure {
        require(amount > 0, "is zero");
    }

    function _checkAmount(uint256 minimumSend) private {
        if (msg.value < minimumSend) {
            revert AmountOfEthSentIsTooSmall(msg.value, minimumSend);
        }
    }
}

// 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 v4.9.0) (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 v4.9.4) (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/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, "\x19Ethereum Signed Message:\n32")
            mstore(0x1c, hash)
            message := keccak256(0x00, 0x3c)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\x19\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            data := keccak256(ptr, 0x42)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Data with intended validator, created from a
     * `validator` and `data` according to the version 0 of EIP-191.
     *
     * See {recover}.
     */
    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x00", validator, data));
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

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

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
// https://github.com/Uniswap/v3-periphery/blob/main/contracts/libraries/TransferHelper.sol
pragma solidity 0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

library TransferHelper {
    /// @notice Transfers tokens from the targeted address to the given destination
    /// @notice Errors with 'STF' if transfer fails
    /// @param token The contract address of the token to be transferred
    /// @param from The originating address from which the tokens will be transferred
    /// @param to The destination address of the transfer
    /// @param value The amount to be transferred
    function safeTransferFrom(address token, address from, address to, uint256 value) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20.transferFrom.selector, from, to, value)
        );
        require(success && (data.length == 0 || abi.decode(data, (bool))), "BP-STF");
    }

    /// @notice Transfers tokens from msg.sender to a recipient
    /// @dev Errors with ST if transfer fails
    /// @param token The contract address of the token which will be transferred
    /// @param to The recipient of the transfer
    /// @param value The value of the transfer
    function safeTransfer(address token, address to, uint256 value) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20.transfer.selector, to, value)
        );
        require(success && (data.length == 0 || abi.decode(data, (bool))), "BP-ST");
    }

    function getBalance(address token) internal view returns (uint256 balance) {
        bytes memory callData = abi.encodeWithSelector(IERC20.balanceOf.selector, address(this));
        (bool success, bytes memory data) = token.staticcall(callData);
        require(success && data.length >= 32);
        balance = abi.decode(data, (uint256));
    }

    function getBalanceOf(address token, address target) internal view returns (uint256 balance) {
        bytes memory callData = abi.encodeWithSelector(IERC20.balanceOf.selector, target);
        (bool success, bytes memory data) = token.staticcall(callData);
        require(success && data.length >= 32);
        balance = abi.decode(data, (uint256));
    }

    function safeApprove(address token, address spender, uint256 amount) internal {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(IERC20.approve.selector, spender, amount)
        );
        require(success && (data.length == 0 || abi.decode(data, (bool))), "BP-SA");
    }
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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alculatePointsAmount","outputs":[{"internalType":"uint256","name":"pointsAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"claimAirDrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"coin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"endTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"minRemainingGas","type":"uint256"},{"components":[{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256[]","name":"rn","type":"uint256[]"}],"internalType":"struct DiceGame.RandomData[]","name":"randomData","type":"tuple[]"}],"name":"fulfillRandomWords","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"gameId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gameNotOver","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gameOver","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gamePeriod","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gameRngWallet","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_gameId","type":"uint256"}],"name":"getGameRoundInfo","outputs":[{"components":[{"internalType":"bool","name":"fulfilled","type":"bool"},{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"totalBet","type":"uint256"},{"internalType":"uint256","name":"totalWinnings","type":"uint256"},{"internalType":"uint256[]","name":"betAmts","type":"uint256[]"},{"internalType":"uint256[]","name":"diceRollResult","type":"uint256[]"}],"internalType":"struct DiceGame.GameRound","name":"gameInfo","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getGameState","outputs":[{"components":[{"internalType":"uint256","name":"gameId","type":"uint256"},{"internalType":"uint256","name":"betNumber","type":"uint256"}],"internalType":"struct DiceGame.GameState[]","name":"state","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getUserGameIds","outputs":[{"internalType":"uint256[]","name":"ids","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getUserGamesNumber","outputs":[{"internalType":"uint256","name":"num","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getUserLastGameInfo","outputs":[{"internalType":"uint256","name":"id","type":"uint256"},{"components":[{"internalType":"bool","name":"fulfilled","type":"bool"},{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"totalBet","type":"uint256"},{"internalType":"uint256","name":"totalWinnings","type":"uint256"},{"internalType":"uint256[]","name":"betAmts","type":"uint256[]"},{"internalType":"uint256[]","name":"diceRollResult","type":"uint256[]"}],"internalType":"struct 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00000000000000000000000063795e0f9223ec4bfef5fbe3dbf9331f1c57cc5c0000000000000000000000000000000000000000000000000000000000069780000000000000000000000000a63532878168c4d8df56a85b7f0f8a1f6abb792e000000000000000000000000d7bcee2eaa9579f39c2290d48e0fa3c706c9015300000000000000000000000000000000000000000000000022b1c8c1227a0000

-----Decoded View---------------
Arg [0] : _gameRngWalletAddress (address): 0x63795e0f9223Ec4BFeF5fBE3dbf9331F1C57cC5c
Arg [1] : _gamePeriod (uint256): 432000
Arg [2] : _V3Deployer (address): 0xA63532878168C4D8Df56A85b7F0f8a1F6ABB792E
Arg [3] : _rollOperator (address): 0xD7BCEE2EaA9579F39c2290d48e0fA3c706C90153
Arg [4] : _airdropRate (uint256): 2500000000000000000

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 00000000000000000000000063795e0f9223ec4bfef5fbe3dbf9331f1c57cc5c
Arg [1] : 0000000000000000000000000000000000000000000000000000000000069780
Arg [2] : 000000000000000000000000a63532878168c4d8df56a85b7f0f8a1f6abb792e
Arg [3] : 000000000000000000000000d7bcee2eaa9579f39c2290d48e0fa3c706c90153
Arg [4] : 00000000000000000000000000000000000000000000000022b1c8c1227a0000