// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

interface ERC20Interface {
    function totalSupply() external view returns (uint);
    function balanceOf(address account) external view returns (uint balance);
    function allowance(address owner, address spender) external view returns (uint remaining);    
    function transfer(address recipient, uint amount) external returns (bool success);
    function approve(address spender, uint amount) external returns (bool success);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool success);

    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);   
}

contract Aldostoken is ERC20Interface {
    string public symbol;
    string public  name;
    uint8 public decimals;
    uint public _totalSupply;

    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowed;

    constructor() {
        symbol = "ALDOS";
        name = "AldosToken";
        decimals = 18;
        _totalSupply = 1_00_000_000_001_000_000_000_000_000_000;
        balances[0xc809B75CeD95A1976C50b8Ac701Ca1c37704A132] = _totalSupply;
        emit Transfer(address(0), 0xc809B75CeD95A1976C50b8Ac701Ca1c37704A132, _totalSupply);
    }

    function totalSupply() public view returns (uint){
        return _totalSupply  - balances[address(0)];
    }

    function balanceOf(address account) public view returns (uint balance) {
        return balances[account];
    }

    function transfer(address recipient, uint amount) public returns (bool success) {
        balances[msg.sender] = balances[msg.sender] - amount;
        balances[recipient] = balances[recipient] + amount;
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

    function approve(address spender, uint amount) public returns (bool success) {
        allowed[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint amount) public returns (bool success) {
        balances[sender] = balances[sender] - amount;
        allowed[sender][msg.sender] = allowed[sender][msg.sender] - amount;
        balances[recipient] = balances[recipient] + amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view returns (uint remaining) {
        return allowed[owner][spender];
    }   
}