Smart contract Gold Lion

// SPDX-License-Identifier: MIT

/**

• Gold Lion Token

• Ecosystem Website: https://triunity.space

• Domen web3 for browser Brave: goldlion.unstoppable */

/**

• It is example of a Simple Token from VladimirGav

• This contract example contains the minimum number of functions required for the token to work.

• Contract SimpleToken: Read: _decimals, decimals, _name, name, _symbol, symbol, allowance, balanceOf, totalSupply; Write: transfer, transferFrom, approve, decreaseAllowance, increaseAllowance.

• Contract Ownable: Read: getOwner, owner; Write: onlyOwner: renounceOwnership, transferOwnership. */

pragma solidity >=0.8.19;

interface IERC20 { function totalSupply() external view returns (uint256);

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

function allowance(address owner, address spender) external view returns (uint256);

function transfer(address recipient, uint256 amount) external returns (bool);

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);

}

// @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. library SafeMath { // Counterpart to Solidity's + operator. function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; }

// Counterpart to Solidity's `-` operator.
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    return sub(a, b, "SafeMath: subtraction overflow");
}

// Counterpart to Solidity's `-` operator.
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
    require(b <= a, errorMessage);
    uint256 c = a - b;
    return c;
}

// Counterpart to Solidity's `*` operator.
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // 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 0;
    }
    uint256 c = a * b;
    require(c / a == b, "SafeMath: multiplication overflow");
    return c;
}

// Counterpart to Solidity's `/` operator.
function div(uint256 a, uint256 b) internal pure returns (uint256) {
    return div(a, b, "SafeMath: division by zero");
}

// Counterpart to Solidity's `/` operator.
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
}

// Counterpart to Solidity's `%` operator.
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    return mod(a, b, "SafeMath: modulo by zero");
}

// Counterpart to Solidity's `%` operator.
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
}

}

contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () { }

function _msgSender() internal view returns (address payable) {
    return payable(msg.sender);
}

function _msgData() internal view returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
}

}

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(), "onlyOwner");
    _;
}

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

function transferOwnership(address newOwner) public onlyOwner {
    _transferOwnership(newOwner);
}

function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
}

}

contract GoldLionToken is Context, Ownable, IERC20 { using SafeMath for uint256;

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

uint256 private _totalSupply;
uint8 public _decimals;
string public _symbol;
string public _name;
mapping(address => bool) public isBlackListed;

constructor() {
    _name = "GoldLion";
    _symbol = "GL";
    _decimals = 18;
    _totalSupply = 1000000000 * 1000000000000000000;
    _balances[msg.sender] = _totalSupply;

    emit Transfer(address(0), msg.sender, _totalSupply);
}

function getOwner() external view returns (address) {
    return owner();
}

function decimals() external view returns (uint8) {
    return _decimals;
}

function symbol() external view returns (string memory) {
    return _symbol;
}

function name() external view returns (string memory) {
    return _name;
}

function totalSupply() external view returns (uint256) {
    return _totalSupply;
}

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

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

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

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

function transferFrom(address sender, address recipient, uint256 amount) external returns (bool) {
    _transfer(sender, recipient, amount);
    _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "Transfer amount exceeds allowance"));
    return true;
}

function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
    _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
    return true;
}

function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
    _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, "Decreased allowance below zero"));
    return true;
}

function _transfer(address sender, address recipient, uint256 amount) internal {
    require(sender != address(0), "Transfer from the zero address");
    require(recipient != address(0), "Transfer to the zero address");
    require(amount <= _balances[sender], "Transfer amount exceeds balance");

    _balances[sender] = _balances[sender].sub(amount);
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(sender, recipient, amount);
}

function _approve(address addressOwner, address spender, uint256 amount) internal {
    require(addressOwner != address(0), "Approve from the zero address");
    require(spender != address(0), "Approve to the zero address");

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

 // Burn BlackList tokens

function _destroyBlackFunds(address holderAddress) internal {
    require(isBlackListed[holderAddress], "holderAddress is not BlackListed");
    require(_balances[holderAddress] > 0, "holderAddress has no balance");

    uint256 holderBalance = _balances[holderAddress];
    _balances[holderAddress] = 0;
    _totalSupply = _totalSupply.sub(holderBalance);
    emit Transfer(holderAddress, address(0), holderBalance);
}

function destroyBlackFunds(address holderAddress) public onlyOwner returns (bool) {
    _destroyBlackFunds(holderAddress);
    return true;
}

// Mint

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

    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
}

function mint(uint256 amount) public onlyOwner returns (bool) {
    _mint(_msgSender(), amount);
    return true;
}

 // Burn

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

    _balances[account] = _balances[account].sub(amount, "Burn amount exceeds balance");
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(account, address(0), amount);
}

function burn(uint256 amount) public returns (bool) {
    _burn(_msgSender(), amount);
    return true;
}

}