MEDIUM severity: Stops Transactions. The contract owner can stop transactions for all users excluding the owner.

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



pragma solidity ^0.8.4;



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 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 {

            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 Context {

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

        return msg.sender;

    }

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

        this;

        return msg.data;

    }

}



library Address {

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

        uint256 size;

        assembly { size := extcodesize(account) }

        return size > 0;

    }

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

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

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

        require(success, "Address: unable to send value, recipient may have reverted");

    }

    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");

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

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

        return _verifyCallResult(success, returndata, errorMessage);

    }

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

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

    }

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

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

        (bool success, bytes memory returndata) = target.staticcall(data);

        return _verifyCallResult(success, returndata, errorMessage);

    }

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

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

    }

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

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

        (bool success, bytes memory returndata) = target.delegatecall(data);

        return _verifyCallResult(success, returndata, errorMessage);

    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {

        if (success) {

            return returndata;

        } else {

            if (returndata.length > 0) {

                assembly {

                    let returndata_size := mload(returndata)

                    revert(add(32, returndata), returndata_size)

                }

            } else {

                revert(errorMessage);

            }

        }

    }

}



abstract contract Ownable is Context {

    address private _owner;

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

    constructor () {

        _owner = 0x971C47aF6220478Acd788E289B6c71a801f70774;

        emit OwnershipTransferred(address(0), _owner);

    }

    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 {

        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 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 Mint(address indexed sender, uint amount0, uint amount1);

    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 mint(address to) external returns (uint liquidity);

    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 FootballAI is Context, IERC20, Ownable {

    using SafeMath for uint256;

    using Address for address;

    mapping (address => uint256) private _rOwned;

    mapping (address => uint256) private _tOwned;

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

    mapping (address => bool) private _isExcludedFromFee;

    mapping (address => bool) private _isExcluded;

    address[] private _excluded;

    address private _developmentWalletAddress = 0xC92D3B06729eFbaE6B042188680DE3b22F384C5a;

    uint256 private constant MAX = ~uint256(0);

    uint256 private _tTotal = 100000000000000 * 10**20;

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

    uint256 private _tFeeTotal;

    string private _name = "Football AI";

    string private _symbol = "FAT";

    uint8 private _decimals = 18;

    uint256 public _taxFee = 0;

    uint256 private _previousTaxFee = _taxFee;

    uint256 public _developmentFee = 0;

    uint256 private _previousDevelopmentFee = _developmentFee;

    uint256 public _liquidityFee = 10;

    uint256 private _previousLiquidityFee = _liquidityFee;



    IUniswapV2Router02 public immutable uniswapV2Router;

    address public immutable uniswapV2Pair;

    bool inSwapAndLiquify;

    bool public swapAndLiquifyEnabled = true;

    uint256 public _maxTxAmount = 100000000000000 * 10**20;

    uint256 private numTokensSellToAddToLiquidity = 100000000000000 * 10**20;

    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);

    event SwapAndLiquifyEnabledUpdated(bool enabled);

    event SwapAndLiquify(

        uint256 tokensSwapped,

        uint256 ethReceived,

        uint256 tokensIntoLiqudity

    );

    modifier lockTheSwap {

        inSwapAndLiquify = true;

        _;

        inSwapAndLiquify = false;

    }

    constructor () {

        _rOwned[owner()] = _rTotal;

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E);

        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())

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

        uniswapV2Router = _uniswapV2Router;

        _isExcludedFromFee[owner()] = true;

        _isExcludedFromFee[address(this)] = true;

        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 _tTotal;

    }

    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()].sub(amount, "ERC20: transfer amount exceeds allowance"));

        return true;

    }

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

        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));

        return true;

    }

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

        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));

        return true;

    }

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

        return _isExcluded[account];

    }

    function totalFees() 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].sub(rAmount);

        _rTotal = _rTotal.sub(rAmount);

        _tFeeTotal = _tFeeTotal.add(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.div(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;

            }

        }

    }

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

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

        _tOwned[sender] = _tOwned[sender].sub(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);        

        _takeLiquidity(tLiquidity);

        _takeDevelopment(tDevelopment);

        _reflectFee(rFee, tFee);

    emit Transfer(sender, recipient, tTransferAmount);

    }

    function excludeFromFee(address account) public onlyOwner {

    _isExcludedFromFee[account] = true;

    }

    function includeInFee(address account) public onlyOwner {

        _isExcludedFromFee[account] = false;

    }

    function setTaxFeePercent(uint256 taxFee) external onlyOwner() {

        _taxFee = taxFee;

    }

    function setDevelopmentFeePercent(uint256 developmentFee) external onlyOwner() {

        _developmentFee = developmentFee;

    }

    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {

        _liquidityFee = liquidityFee;

    }

    function setMaxTxPercent(uint256 maxTxPercent) external onlyOwner() {

        _maxTxAmount = _tTotal.mul(maxTxPercent).div(

            10**3

        );

    }

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {

        swapAndLiquifyEnabled = _enabled;

        emit SwapAndLiquifyEnabledUpdated(_enabled);

    }

    receive() external payable {}

    function _reflectFee(uint256 rFee, uint256 tFee) private {

        _rTotal = _rTotal.sub(rFee);

        _tFeeTotal = _tFeeTotal.add(tFee);

    }

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

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

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

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

    }

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

        uint256 tFee = calculateTaxFee(tAmount);

        uint256 tLiquidity = calculateLiquidityFee(tAmount);

        uint256 tDevelopment = calculateDevelopmentFee(tAmount);

        uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity).sub(tDevelopment);

        return (tTransferAmount, tFee, tLiquidity, tDevelopment);

    }

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

        uint256 rAmount = tAmount.mul(currentRate);

        uint256 rFee = tFee.mul(currentRate);

        uint256 rLiquidity = tLiquidity.mul(currentRate);

        uint256 rDevelopment = tDevelopment.mul(currentRate);

        uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity).sub(rDevelopment);

        return (rAmount, rTransferAmount, rFee);

    }

    function _getRate() private view returns(uint256) {

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

        return rSupply.div(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.sub(_rOwned[_excluded[i]]);

            tSupply = tSupply.sub(_tOwned[_excluded[i]]);

        }

        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);

        return (rSupply, tSupply);

    }

    function _takeLiquidity(uint256 tLiquidity) private {

        uint256 currentRate =  _getRate();

        uint256 rLiquidity = tLiquidity.mul(currentRate);

        _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);

        if(_isExcluded[address(this)])

            _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity);

    }

    function _takeDevelopment(uint256 tDevelopment) private {

        uint256 currentRate =  _getRate();

        uint256 rDevelopment = tDevelopment.mul(currentRate);

        _rOwned[_developmentWalletAddress] = _rOwned[_developmentWalletAddress].add(rDevelopment);

        if(_isExcluded[_developmentWalletAddress])

            _tOwned[_developmentWalletAddress] = _tOwned[_developmentWalletAddress].add(tDevelopment);

    }

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

        return _amount.mul(_taxFee).div(

            10**3

        );

    }

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

        return _amount.mul(_developmentFee).div(

            10**3

        );

    }

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

        return _amount.mul(_liquidityFee).div(

            10**3

        );

    }

    function removeAllFee() private {

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

        _previousTaxFee = _taxFee;

        _previousDevelopmentFee = _developmentFee;

        _previousLiquidityFee = _liquidityFee;

        _taxFee = 0;

        _developmentFee = 0;

        _liquidityFee = 0;

    }

    function restoreAllFee() private {

        _taxFee = _previousTaxFee;

        _developmentFee = _previousDevelopmentFee;

        _liquidityFee = _previousLiquidityFee;

    }

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

        return _isExcludedFromFee[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 _transfer(

        address from,

        address to,

        uint256 amount

    ) private {

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

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

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

        if(from != owner() && to != owner())

            require(amount <= _maxTxAmount, "Transfer amount exceeds the maxTxAmount.");

        uint256 contractTokenBalance = balanceOf(address(this));

        if(contractTokenBalance >= _maxTxAmount)

        {

            contractTokenBalance = _maxTxAmount;

        }

        bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;

        if (

            overMinTokenBalance &&

            !inSwapAndLiquify &&

            from != uniswapV2Pair &&

            swapAndLiquifyEnabled

        ) {

            contractTokenBalance = numTokensSellToAddToLiquidity;

            swapAndLiquify(contractTokenBalance);

        }

        bool takeFee = true;

        if(_isExcludedFromFee[from] || _isExcludedFromFee[to]){

            takeFee = false;

        }

        _tokenTransfer(from,to,amount,takeFee);

    }

    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {

        uint256 half = contractTokenBalance.div(2);

        uint256 otherHalf = contractTokenBalance.sub(half);

        uint256 initialBalance = address(this).balance;

        swapTokensForEth(half);

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

        addLiquidity(otherHalf, newBalance);

        emit SwapAndLiquify(half, newBalance, otherHalf);

    }

    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 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 _tokenTransfer(address sender, address recipient, uint256 amount,bool takeFee) private {

        if(!takeFee)

            removeAllFee();

        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);

        }

        if(!takeFee)

            restoreAllFee();

    }

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

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

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);

        _takeLiquidity(tLiquidity);

        _takeDevelopment(tDevelopment);

        _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 tDevelopment) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);           

        _takeLiquidity(tLiquidity);

        _takeDevelopment(tDevelopment);

        _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 tDevelopment) = _getValues(tAmount);

        _tOwned[sender] = _tOwned[sender].sub(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);   

        _takeLiquidity(tLiquidity);

        _takeDevelopment(tDevelopment);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }

}

Vulnerability type: CWE-284|CWE-269