HIGH severity: Zero Division. Variables may be set to zero as denominators, leading to unpredictable results.

Vulnerable code:
// SPDX-License-Identifier: MIT

// Website: https://karmawillgetyou.com

// Telegram: https://t.me/Karma_Portal



/**

  _  __    _    ____  __  __    _    

 | |/ /   / \  |  _ \|  \/  |  / \   

 | ' /   / _ \ | |_) | |\/| | / _ \  

 | . \  / ___ \|  _ <| |  | |/ ___ \ 

 |_|\_\/_/   \_\_| \_\_|  |_/_/   \_\

                                     

*/         

                                                     

pragma solidity 0.8.17;



abstract contract Context {

    function _msgSender() internal view virtual returns (address payable) {

        return payable(msg.sender);

    }



    function _msgData() internal view virtual returns (bytes memory) {

        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691

        return msg.data;

    }

}



abstract contract Ownable is Context {

    address private _owner;



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



    constructor () {

        address msgSender = _msgSender();

        _owner = msgSender;

        emit OwnershipTransferred(address(0), msgSender);

    }



    function owner() public view returns (address) {

        return _owner;

    }



    modifier onlyOwner() {

        require(_owner == _msgSender(), "Ownable: caller is not the owner");

        _;

    }



    function renounceOwnership() public virtual onlyOwner {

        emit OwnershipTransferred(_owner, address(0));

        _owner = address(0);

    }



    function transferOwnership(address newOwner) public virtual onlyOwner {

        require(newOwner != address(0), "Ownable: new owner is the zero address");

        emit OwnershipTransferred(_owner, newOwner);

        _owner = newOwner;

    }

}



interface IERC20 {

    function totalSupply() external view returns (uint256);

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

    function transfer(address recipient, 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 sender,

        address recipient,

        uint256 amount

    ) external returns (bool);

   

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

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

}



library Address {

    function isContract(address account) internal view returns (bool) {

        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts

        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned

        // for accounts without code, i.e. `keccak256('')`

        bytes32 codehash;

        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;

        // solhint-disable-next-line no-inline-assembly

        assembly { codehash := extcodehash(account) }

        return (codehash != accountHash && codehash != 0x0);

    }



    function sendValue(address payable recipient, uint256 amount) internal returns(bool){

        require(address(this).balance >= amount, "Address: insufficient balance");



        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value

        (bool success, ) = recipient.call{ value: amount }("");

        return success;

    }



    function functionCall(address target, bytes memory data) internal returns (bytes memory) {

      return functionCall(target, data, "Address: low-level call failed");

    }



    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {

        return _functionCallWithValue(target, data, 0, errorMessage);

    }



    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {

        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");

    }



    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {

        require(address(this).balance >= value, "Address: insufficient balance for call");

        return _functionCallWithValue(target, data, value, errorMessage);

    }



    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {

        require(isContract(target), "Address: call to non-contract");



        // solhint-disable-next-line avoid-low-level-calls

        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);

        if (success) {

            return returndata;

        } else {

            // Look for revert reason and bubble it up if present

            if (returndata.length > 0) {

                // The easiest way to bubble the revert reason is using memory via assembly



                // solhint-disable-next-line no-inline-assembly

                assembly {

                    let returndata_size := mload(returndata)

                    revert(add(32, returndata), returndata_size)

                }

            } else {

                revert(errorMessage);

            }

        }

    }

}



interface IUniswapV2Factory {

    event PairCreated(address indexed token0, address indexed token1, address pair, uint);



    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(uint) external view returns (address pair);

    function allPairsLength() external view returns (uint);



    function createPair(address tokenA, address tokenB) external returns (address pair);



    function setFeeTo(address) external;

    function setFeeToSetter(address) external;

}



interface IUniswapV2Pair {

    event Approval(address indexed owner, address indexed spender, uint value);

    event Transfer(address indexed from, address indexed to, uint 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 (uint);

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

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



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

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

    function transferFrom(address from, address to, uint 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 (uint);



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



    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);

    event Swap(

        address indexed sender,

        uint amount0In,

        uint amount1In,

        uint amount0Out,

        uint amount1Out,

        address indexed to

    );

    event Sync(uint112 reserve0, uint112 reserve1);



    function MINIMUM_LIQUIDITY() external pure returns (uint);

    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 (uint);

    function price1CumulativeLast() external view returns (uint);

    function kLast() external view returns (uint);



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

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

    function skim(address to) external;

    function sync() external;



    function initialize(address, address) external;

}



interface IUniswapV2Router01 {

    function factory() external pure returns (address);

    function WETH() external pure returns (address);



    function addLiquidity(

        address tokenA,

        address tokenB,

        uint amountADesired,

        uint amountBDesired,

        uint amountAMin,

        uint amountBMin,

        address to,

        uint deadline

    ) external returns (uint amountA, uint amountB, uint liquidity);

    function addLiquidityETH(

        address token,

        uint amountTokenDesired,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline

    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function removeLiquidity(

        address tokenA,

        address tokenB,

        uint liquidity,

        uint amountAMin,

        uint amountBMin,

        address to,

        uint deadline

    ) external returns (uint amountA, uint amountB);

    function removeLiquidityETH(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline

    ) external returns (uint amountToken, uint amountETH);

    function removeLiquidityWithPermit(

        address tokenA,

        address tokenB,

        uint liquidity,

        uint amountAMin,

        uint amountBMin,

        address to,

        uint deadline,

        bool approveMax, uint8 v, bytes32 r, bytes32 s

    ) external returns (uint amountA, uint amountB);

    function removeLiquidityETHWithPermit(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline,

        bool approveMax, uint8 v, bytes32 r, bytes32 s

    ) external returns (uint amountToken, uint amountETH);

    function swapExactTokensForTokens(

        uint amountIn,

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external returns (uint[] memory amounts);

    function swapTokensForExactTokens(

        uint amountOut,

        uint amountInMax,

        address[] calldata path,

        address to,

        uint deadline

    ) external returns (uint[] memory amounts);

    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)

        external

        payable

        returns (uint[] memory amounts);

    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)

        external

        returns (uint[] memory amounts);

    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)

        external

        returns (uint[] memory amounts);

    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)

        external

        payable

        returns (uint[] memory amounts);



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

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

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

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

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

}



interface IUniswapV2Router02 is IUniswapV2Router01 {

    function removeLiquidityETHSupportingFeeOnTransferTokens(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline

    ) external returns (uint amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline,

        bool approveMax, uint8 v, bytes32 r, bytes32 s

    ) external returns (uint amountETH);



    function swapExactTokensForTokensSupportingFeeOnTransferTokens(

        uint amountIn,

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(

        uint amountIn,

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external;

}



contract KARMA is Context, IERC20, Ownable {

    using Address for address;

    using Address for address payable;



    mapping (address => uint256) private _rOwned;

    mapping (address => uint256) private _tOwned;

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



    mapping (address => bool) private _isExcludedFromFees;

    mapping (address => bool) private _isExcluded;

    address[] private _excluded;



    string private _name     = "Karma";

    string private _symbol   = "KARMA";

    uint8  private _decimals = 9;

   

    uint256 private constant MAX = type(uint256).max;

    uint256 private _tTotal = 1e9 * (10 ** _decimals);

    uint256 private _tTotalSupply = 1e9 * (10 ** _decimals);

    uint256 private _rTotal = (MAX - (MAX % _tTotal));

    uint256 private _tFeeTotal;



    uint256 public taxFeeonBuy;

    uint256 public taxFeeonSell;



    uint256 public liquidityFeeonBuy;

    uint256 public liquidityFeeonSell;



    uint256 public marketingFeeonBuy;

    uint256 public marketingFeeonSell;



    uint256 public burnFeeOnBuy;

    uint256 public burnFeeOnSell;



    uint256 private _taxFee;

    uint256 private _liquidityFee;

    uint256 private _marketingFee;



    uint256 private totalBuyFees;

    uint256 private totalSellFees;



    address public marketingWallet;



    bool public walletToWalletTransferWithoutFee;

    

    address private DEAD = 0x000000000000000000000000000000000000dEaD;



    IUniswapV2Router02 public  uniswapV2Router;

    address public  uniswapV2Pair;



    bool private inSwapAndLiquify;

    bool public swapEnabled;

    bool public tradingEnabled;

    uint256 public swapTokensAtAmount;



    event ExcludeFromFees(address indexed account, bool isExcluded);

    event MarketingWalletChanged(address marketingWallet);

    event SwapEnabledUpdated(bool enabled);

    event SwapAndLiquify(uint256 tokensSwapped, uint256 bnbReceived, uint256 tokensIntoLiqudity);

    event SwapAndSendMarketing(uint256 tokensSwapped, uint256 bnbSend);

    event SwapTokensAtAmountUpdated(uint256 amount);

    event BuyFeesChanged(uint256 taxFee, uint256 liquidityFee, uint256 marketingFee);

    event SellFeesChanged(uint256 taxFee, uint256 liquidityFee, uint256 marketingFee);

    event WalletToWalletTransferWithoutFeeEnabled(bool enabled);

    

    constructor() 

    {        

        address router;

        if (block.chainid == 56) {

            router = 0x10ED43C718714eb63d5aA57B78B54704E256024E; 

        } else if (block.chainid == 97) {

            router =  0xD99D1c33F9fC3444f8101754aBC46c52416550D1; 

        } else if (block.chainid == 1 || block.chainid == 5) {

            router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; 

        } else {

            revert();

        }



        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(router);

        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())

            .createPair(address(this), _uniswapV2Router.WETH());

        uniswapV2Router = _uniswapV2Router;



        _approve(address(this), address(uniswapV2Router), MAX);



        taxFeeonBuy = 10;

        taxFeeonSell = 10;



        liquidityFeeonBuy = 30;

        liquidityFeeonSell = 30;



        marketingFeeonBuy = 30;

        marketingFeeonSell = 30;



        burnFeeOnBuy = 0;

        burnFeeOnSell = 0;



        totalBuyFees = taxFeeonBuy + liquidityFeeonBuy + marketingFeeonBuy + burnFeeOnBuy;

        totalSellFees = taxFeeonSell + liquidityFeeonSell + marketingFeeonSell + burnFeeOnSell;



        marketingWallet = 0x8a2B9AA93E9Dda74120451280795377710dd952F;

        

        swapEnabled = true;

        swapTokensAtAmount = _tTotal / 5000;



        maxTransactionLimitEnabled  = true;



        maxTransactionAmountBuy     = _tTotal * 15 / 1000;

        maxTransactionAmountSell    = _tTotal * 15 / 1000;



        _isExcludedFromMaxTxLimit[owner()] = true;

        _isExcludedFromMaxTxLimit[address(0)] = true;

        _isExcludedFromMaxTxLimit[address(this)] = true;

        _isExcludedFromMaxTxLimit[marketingWallet] = true;

        _isExcludedFromMaxTxLimit[DEAD] = true;

    

        walletToWalletTransferWithoutFee = true;

        

        _isExcludedFromFees[owner()] = true;

        _isExcludedFromFees[address(0xdead)] = true;

        _isExcludedFromFees[address(this)] = true;



        _isExcluded[address(this)] = true;

        _isExcluded[address(0x407993575c91ce7643a4d4cCACc9A98c36eE1BBE)] = true; //pinklock

        _isExcluded[address(0xdead)] = true;

        _isExcluded[address(uniswapV2Pair)] = true;



        _rOwned[owner()] = _rTotal;

        _tOwned[owner()] = _tTotal;



        emit Transfer(address(0), owner(), _tTotal);

    }



    function name() public view returns (string memory) {

        return _name;

    }



    function symbol() public view returns (string memory) {

        return _symbol;

    }



    function decimals() public view returns (uint8) {

        return _decimals;

    }



    function totalSupply() public view override returns (uint256) {

        return _tTotalSupply;

    }



    function balanceOf(address account) public view override returns (uint256) {

        if (_isExcluded[account]) return _tOwned[account];

        return tokenFromReflection(_rOwned[account]);

    }



    function transfer(address recipient, uint256 amount) public override returns (bool) {

        _transfer(_msgSender(), recipient, amount);

        return true;

    }



    function allowance(address owner, address spender) public view override returns (uint256) {

        return _allowances[owner][spender];

    }



    function approve(address spender, uint256 amount) public override returns (bool) {

        _approve(_msgSender(), spender, amount);

        return true;

    }



    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {

        _transfer(sender, recipient, amount);

        _approve(sender, _msgSender(), _allowances[sender][_msgSender()] - amount);

        return true;

    }



    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {

        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);

        return true;

    }



    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {

        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] - subtractedValue);

        return true;

    }



    function isExcludedFromReward(address account) public view returns (bool) {

        return _isExcluded[account];

    }



    function totalReflectionDistributed() public view returns (uint256) {

        return _tFeeTotal;

    }



    function deliver(uint256 tAmount) public {

        address sender = _msgSender();

        require(!_isExcluded[sender], "Excluded addresses cannot call this function");

        (uint256 rAmount,,,,,,) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender] - rAmount;

        _rTotal = _rTotal - rAmount;

        _tFeeTotal = _tFeeTotal + tAmount;

    }



    function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256) {

        require(tAmount <= _tTotal, "Amount must be less than supply");

        if (!deductTransferFee) {

            (uint256 rAmount,,,,,,) = _getValues(tAmount);

            return rAmount;

        } else {

            (,uint256 rTransferAmount,,,,,) = _getValues(tAmount);

            return rTransferAmount;

        }

    }



    function tokenFromReflection(uint256 rAmount) public view returns(uint256) {

        require(rAmount <= _rTotal, "Amount must be less than total reflections");

        uint256 currentRate =  _getRate();

        return rAmount / currentRate;

    }



    function excludeFromReward(address account) public onlyOwner() {

        require(!_isExcluded[account], "Account is already excluded");

        if(_rOwned[account] > 0) {

            _tOwned[account] = tokenFromReflection(_rOwned[account]);

        }

        _isExcluded[account] = true;

        _excluded.push(account);

    }



    function includeInReward(address account) external onlyOwner() {

        require(_isExcluded[account], "Account is already included");

        for (uint256 i = 0; i < _excluded.length; i++) {

            if (_excluded[i] == account) {

                _excluded[i] = _excluded[_excluded.length - 1];

                _tOwned[account] = 0;

                _isExcluded[account] = false;

                _excluded.pop();

                break;

            }

        }

    }



    receive() external payable {}



    function claimStuckTokens(address token) external onlyOwner {

        require(token != address(this), "Owner cannot claim native tokens");

        if (token == address(0x0)) {

            payable(msg.sender).sendValue(address(this).balance);

            return;

        }

        IERC20 ERC20token = IERC20(token);

        uint256 balance = ERC20token.balanceOf(address(this));

        ERC20token.transfer(msg.sender, balance);

    }



    function _reflectFee(uint256 rFee, uint256 tFee) private {

        _rTotal = _rTotal - rFee;

        _tFeeTotal = _tFeeTotal + tFee;

    }



    function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256, uint256) {

        (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tMarketing) = _getTValues(tAmount);

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, tMarketing, _getRate());

        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity, tMarketing);

    }



    function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256) {

        uint256 tFee = calculateTaxFee(tAmount);

        uint256 tLiquidity = calculateLiquidityFee(tAmount);

        uint256 tMarketing = calculateMarketingFee(tAmount);

        uint256 tTransferAmount = tAmount - tFee - tLiquidity - tMarketing;

        return (tTransferAmount, tFee, tLiquidity, tMarketing);

    }



    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 tMarketing, uint256 currentRate) private pure returns (uint256, uint256, uint256) {

        uint256 rAmount = tAmount * currentRate;

        uint256 rFee = tFee * currentRate;

        uint256 rLiquidity = tLiquidity * currentRate;

        uint256 rMarketing = tMarketing * currentRate;

        uint256 rTransferAmount = rAmount - rFee - rLiquidity - rMarketing;

        return (rAmount, rTransferAmount, rFee);

    }



    function _getRate() private view returns(uint256) {

        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();

        return rSupply / tSupply;

    }



    function _getCurrentSupply() private view returns(uint256, uint256) {

        uint256 rSupply = _rTotal;

        uint256 tSupply = _tTotal;      

        for (uint256 i = 0; i < _excluded.length; i++) {

            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);

            rSupply = rSupply - _rOwned[_excluded[i]];

            tSupply = tSupply - _tOwned[_excluded[i]];

        }

        if (rSupply < _rTotal / _tTotal) return (_rTotal, _tTotal);

        return (rSupply, tSupply);

    }

    

    function _takeLiquidity(uint256 tLiquidity) private {

        uint256 liquidityAmount = tLiquidity * (liquidityFeeonBuy + liquidityFeeonSell) / (liquidityFeeonBuy + liquidityFeeonSell + burnFeeOnBuy + burnFeeOnSell);

        uint256 burnAmount = tLiquidity - liquidityAmount;



        if(liquidityAmount > 0){

            uint256 currentRate =  _getRate();

            uint256 rLiquidity = liquidityAmount * currentRate;

            _rOwned[address(this)] = _rOwned[address(this)] + rLiquidity;

            if(_isExcluded[address(this)])

                _tOwned[address(this)] = _tOwned[address(this)] + liquidityAmount;

        }



        if(burnAmount > 0){

            uint256 currentRate =  _getRate();

            uint256 rBurn = burnAmount * currentRate;

            _rOwned[address(0xdead)] = _rOwned[address(0xdead)] + rBurn;

            if(_isExcluded[address(0xdead)])

                _tOwned[address(0xdead)] = _tOwned[address(0xdead)] + burnAmount;



            _tTotalSupply -= burnAmount;

        }

    }



    function _takeMarketing(uint256 tMarketing) private {

        if (tMarketing > 0) {

            uint256 currentRate =  _getRate();

            uint256 rMarketing = tMarketing * currentRate;

            _rOwned[address(this)] = _rOwned[address(this)] + rMarketing;

            if(_isExcluded[address(this)])

                _tOwned[address(this)] = _tOwned[address(this)] + tMarketing;

        }

    }

    

    function calculateTaxFee(uint256 _amount) private view returns (uint256) {

        return _amount * _taxFee / 1000;

    }



    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {

        return _amount * _liquidityFee / 1000;

    }

    

    function calculateMarketingFee(uint256 _amount) private view returns (uint256) {

        return _amount * _marketingFee / 1000;

    }

    

    function removeAllFee() private {

        if(_taxFee == 0 && _liquidityFee == 0 && _marketingFee == 0) return;

        

        _taxFee = 0;

        _marketingFee = 0;

        _liquidityFee = 0;

    }

    

    function setBuyFee() private{

        if(_taxFee == taxFeeonBuy && _liquidityFee == (liquidityFeeonBuy + burnFeeOnBuy) && _marketingFee == marketingFeeonBuy ) return;



        _taxFee = taxFeeonBuy;

        _marketingFee = marketingFeeonBuy;

        _liquidityFee = liquidityFeeonBuy + burnFeeOnBuy;

    }



    function setSellFee() private{

        if(_taxFee == taxFeeonSell && _liquidityFee == (liquidityFeeonSell + burnFeeOnSell) && _marketingFee == marketingFeeonSell ) return;



        _taxFee = taxFeeonSell;

        _marketingFee = marketingFeeonSell;

        _liquidityFee = liquidityFeeonSell + burnFeeOnSell;

    }

    

    function isExcludedFromFee(address account) public view returns(bool) {

        return _isExcludedFromFees[account];

    }



    function _approve(address owner, address spender, uint256 amount) private {

        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 enableTrading() external onlyOwner{

        require(tradingEnabled == false, "Trading is already enabled");

        tradingEnabled = true;

    }

    

    function _transfer(

        address from,

        address to,

        uint256 amount

    ) private {

        require(from != address(0), "ERC20: transfer from the zero address");

        require(amount > 0, "Transfer amount must be greater than zero");



        if(!_isExcludedFromFees[from] && !_isExcludedFromFees[to]) {

            require(tradingEnabled, "Trading is not enabled yet");

        }



        if (maxTransactionLimitEnabled) 

        {

            if ((from == uniswapV2Pair || to == uniswapV2Pair) &&

                _isExcludedFromMaxTxLimit[from] == false && 

                _isExcludedFromMaxTxLimit[to]   == false) 

            {

                if (from == uniswapV2Pair) {

                    require(

                        amount <= maxTransactionAmountBuy,  

                        "AntiWhale: Transfer amount exceeds the maxTransactionAmount"

                    );

                } else {

                    require(

                        amount <= maxTransactionAmountSell, 

                        "AntiWhale: Transfer amount exceeds the maxTransactionAmount"

                    );

                }

            }

        }



        uint256 contractTokenBalance = balanceOf(address(this));        

        bool overMinTokenBalance = contractTokenBalance >= swapTokensAtAmount;

        if (

            overMinTokenBalance &&

            !inSwapAndLiquify &&

            to == uniswapV2Pair &&

            swapEnabled

        ) {

            inSwapAndLiquify = true;

            

            uint256 marketingShare = marketingFeeonBuy + marketingFeeonSell;

            uint256 liquidityShare = liquidityFeeonBuy + liquidityFeeonSell;



            uint256 totalShare = marketingShare + liquidityShare;



            if(totalShare > 0) {

                if(liquidityShare > 0) {

                    uint256 liquidityTokens = (contractTokenBalance * liquidityShare) / totalShare;

                    swapAndLiquify(liquidityTokens);

                }

                

                if(marketingShare > 0) {

                    uint256 marketingTokens = (contractTokenBalance * marketingShare) / totalShare;

                    swapAndSendMarketing(marketingTokens);

                } 

            }



            inSwapAndLiquify = false;

        }

        

        //transfer amount, it will take tax, burn, liquidity fee

        _tokenTransfer(from,to,amount);

    }



    function swapAndLiquify(uint256 tokens) private {

        uint256 half = tokens / 2;

        uint256 otherHalf = tokens - half;



        uint256 initialBalance = address(this).balance;



        address[] memory path = new address[](2);

        path[0] = address(this);

        path[1] = uniswapV2Router.WETH();



        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(

            half,

            0, // accept any amount of ETH

            path,

            address(this),

            block.timestamp);

        

        uint256 newBalance = address(this).balance - initialBalance;



        uniswapV2Router.addLiquidityETH{value: newBalance}(

            address(this),

            otherHalf,

            0, // slippage is unavoidable

            0, // slippage is unavoidable

            DEAD,

            block.timestamp

        );



        emit SwapAndLiquify(half, newBalance, otherHalf);

    }



    function swapAndSendMarketing(uint256 tokenAmount) private {

        uint256 initialBalance = address(this).balance;



        address[] memory path = new address[](2);

        path[0] = address(this);

        path[1] = uniswapV2Router.WETH();



        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(

            tokenAmount,

            0, // accept any amount of ETH

            path,

            address(this),

            block.timestamp);



        uint256 newBalance = address(this).balance - initialBalance;



        payable(marketingWallet).sendValue(newBalance);



        emit SwapAndSendMarketing(tokenAmount, newBalance);

    }



    function setSwapTokensAtAmount(uint256 newAmount) external onlyOwner() {

        require(newAmount > totalSupply() / 1e5, "SwapTokensAtAmount must be greater than 0.001% of total supply");

        swapTokensAtAmount = newAmount;

        emit SwapTokensAtAmountUpdated(newAmount);

    }

    

    function setSwapEnabled(bool _enabled) external onlyOwner {

        swapEnabled = _enabled;

        emit SwapEnabledUpdated(_enabled);

    }



    function _tokenTransfer(address sender, address recipient, uint256 amount) private {

         if (_isExcludedFromFees[sender] || 

            _isExcludedFromFees[recipient] 

            ) {

            removeAllFee();

        }else if(recipient == uniswapV2Pair){

            setSellFee();

        }else if(sender == uniswapV2Pair){

            setBuyFee();

        }else if(walletToWalletTransferWithoutFee){

            removeAllFee();

        }else{

            setSellFee();

        }



        if (_isExcluded[sender] && !_isExcluded[recipient]) {

            _transferFromExcluded(sender, recipient, amount);

        } else if (!_isExcluded[sender] && _isExcluded[recipient]) {

            _transferToExcluded(sender, recipient, amount);

        } else if (!_isExcluded[sender] && !_isExcluded[recipient]) {

            _transferStandard(sender, recipient, amount);

        } else if (_isExcluded[sender] && _isExcluded[recipient]) {

            _transferBothExcluded(sender, recipient, amount);

        } else {

            _transferStandard(sender, recipient, amount);

        }

    }



    function _transferStandard(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tMarketing) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender] - rAmount;

        _rOwned[recipient] = _rOwned[recipient] + rTransferAmount;

        _takeMarketing(tMarketing);

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }



    function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tMarketing) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender] - rAmount;

        _tOwned[recipient] = _tOwned[recipient] + tTransferAmount;

        _rOwned[recipient] = _rOwned[recipient] + rTransferAmount;

        _takeMarketing(tMarketing);           

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }



    function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tMarketing) = _getValues(tAmount);

        _tOwned[sender] = _tOwned[sender] - tAmount;

        _rOwned[sender] = _rOwned[sender] - rAmount;

        _rOwned[recipient] = _rOwned[recipient] + rTransferAmount; 

        _takeMarketing(tMarketing);  

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }



    function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity, uint256 tMarketing) = _getValues(tAmount);

        _tOwned[sender] = _tOwned[sender] - tAmount;

        _rOwned[sender] = _rOwned[sender] - rAmount;

        _tOwned[recipient] = _tOwned[recipient] + tTransferAmount;

        _rOwned[recipient] = _rOwned[recipient] + rTransferAmount;

        _takeMarketing(tMarketing);        

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }



    function excludeFromFees(address account, bool excluded) external onlyOwner {

        require(_isExcludedFromFees[account] != excluded, "Account is already the value of 'excluded'");

        _isExcludedFromFees[account] = excluded;



        emit ExcludeFromFees(account, excluded);

    }

    

    function changeMarketingWallet(address _marketingWallet) external onlyOwner {

        require(_marketingWallet != marketingWallet, "Marketing wallet is already that address");

        require(_marketingWallet!=address(0), "Marketing wallet is the zero address");

        marketingWallet = _marketingWallet;

        emit MarketingWalletChanged(marketingWallet);

    }



    function setBuyFeePercentages(uint256 _taxFeeonBuy, uint256 _liquidityFeeonBuy, uint256 _marketingFeeonBuy, uint256 _burnFeeOnBuy) external onlyOwner {

        taxFeeonBuy = _taxFeeonBuy;

        liquidityFeeonBuy = _liquidityFeeonBuy;

        marketingFeeonBuy = _marketingFeeonBuy;

        burnFeeOnBuy = _burnFeeOnBuy;



        totalBuyFees = taxFeeonBuy + liquidityFeeonBuy + marketingFeeonBuy + burnFeeOnBuy;



        require(totalBuyFees <= 100, "Buy fees cannot be greater than 10%");



        emit BuyFeesChanged(taxFeeonBuy, liquidityFeeonBuy, marketingFeeonBuy);

    }



    function setSellFeePercentages(uint256 _taxFeeonSell, uint256 _liquidityFeeonSell, uint256 _marketingFeeonSell, uint256 _burnFeeOnSell) external onlyOwner {

        taxFeeonSell = _taxFeeonSell;

        liquidityFeeonSell = _liquidityFeeonSell;

        marketingFeeonSell = _marketingFeeonSell;

        burnFeeOnSell = _burnFeeOnSell;



        totalSellFees = taxFeeonSell + liquidityFeeonSell + marketingFeeonSell + burnFeeOnSell;



        require(totalSellFees <= 100, "Sell fees cannot be greater than 10%");



        emit SellFeesChanged(taxFeeonSell, liquidityFeeonSell, marketingFeeonSell);

    }



    function enableWalletToWalletTransferWithoutFee(bool enable) external onlyOwner {

        require(walletToWalletTransferWithoutFee != enable, "Wallet to wallet transfer without fee is already set to that value");

        walletToWalletTransferWithoutFee = enable;

        emit WalletToWalletTransferWithoutFeeEnabled(enable);

    }



    mapping(address => bool) private _isExcludedFromMaxTxLimit;

    bool    public  maxTransactionLimitEnabled;

    uint256 public  maxTransactionAmountBuy;

    uint256 public  maxTransactionAmountSell;



    event ExcludedFromMaxTransactionLimit(address indexed account, bool isExcluded);

    event MaxTransactionLimitStateChanged(bool maxTransactionLimit);

    event MaxTransactionLimitAmountChanged(uint256 maxTransactionAmountBuy, uint256 maxTransactionAmountSell);



    function setEnableMaxTransactionLimit(bool enable) external onlyOwner {

        require(

            enable != maxTransactionLimitEnabled, 

            "Max transaction limit is already set to that state"

        );

        maxTransactionLimitEnabled = enable;

        emit MaxTransactionLimitStateChanged(maxTransactionLimitEnabled);

    }



    function setMaxTransactionAmounts(uint256 _maxTransactionAmountBuy, uint256 _maxTransactionAmountSell) external onlyOwner {

        require(

            _maxTransactionAmountBuy  >= totalSupply() / (10 ** decimals()) / 1000 && 

            _maxTransactionAmountSell >= totalSupply() / (10 ** decimals()) / 1000, 

            "Max Transaction limis cannot be lower than 0.1% of total supply"

        ); 

        maxTransactionAmountBuy  = _maxTransactionAmountBuy  * (10 ** decimals());

        maxTransactionAmountSell = _maxTransactionAmountSell * (10 ** decimals());

        emit MaxTransactionLimitAmountChanged(maxTransactionAmountBuy, maxTransactionAmountSell);

    }



    function setExcludeFromMaxTransactionLimit(address account, bool exclude) external onlyOwner {

        require(

            _isExcludedFromMaxTxLimit[account] != exclude, 

            "Account is already set to that state"

        );

        _isExcludedFromMaxTxLimit[account] = exclude;

        emit ExcludedFromMaxTransactionLimit(account, exclude);

    }



    function isExcludedFromMaxTransaction(address account) public view returns(bool) {

        return _isExcludedFromMaxTxLimit[account];

    }

}

Vulnerability type: CWE-682|CWE-369