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scripts...tarea.sol

// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.17;
pragma experimental ABIEncoderV2;

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

    function balanceOf(address _tokenOwner) 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 _owner,
        address _buyer,
        uint256 _amount
    ) external returns (bool);

    function increaseTotalSupply(
        uint _newTokensAmount
    ) external returns (bool);
}

contract MyToken is MyTokenInterfaces {
    string public constant name = unicode"Introducción a Blockchain";
    string public constant symbol = "IBTOK";
    uint8 public constant decimals = 18;
    uint256 private totalSupply_;

    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) allowed;

    event Transfer(address indexed _from, address indexed _to, uint256 _amount);
    event Approval(
        address indexed _owner,
        address indexed _spender,
        uint256 _amount
    );

    constructor(uint256 _initialSupply) {
        totalSupply_ = _initialSupply;
        balances[msg.sender] = totalSupply_;
    }

    function totalSupply() public view override returns (uint256) {
        return totalSupply_;
    }

    function balanceOf(address _tokenOwner)
        public
        view
        override
        returns (uint256)
    {
        return balances[_tokenOwner];
    }

    function allowance(address _owner, address _spender)
        public
        view
        override
        returns (uint256)
    {
        return allowed[_owner][_spender];
    }

    function transfer(address _recipient, uint256 _amount)
        public
        override
        returns (bool)
    {
        require(_amount <= balances[msg.sender]);
        balances[msg.sender] -= _amount;
        balances[_recipient] += _amount;

        emit Transfer(msg.sender, _recipient, _amount);
        return true;
    }

    function approve(address _spender, uint256 _amount)
        public
        override
        returns (bool)
    {
        allowed[msg.sender][_spender] = _amount;

        emit Approval(msg.sender, _spender, _amount);
        return true;
    }

    function transferFrom(
        address _owner,
        address _buyer,
        uint256 _amount
    ) public override returns (bool) {
        require(_amount <= balances[_owner]);
        require(_amount <= allowed[_owner][msg.sender]);

        balances[_owner] -= _amount;
        allowed[_owner][msg.sender] -= _amount;
        balances[_buyer] += _amount;

        emit Transfer(_owner, _buyer, _amount);
        return true;
    }

    function increaseTotalSupply(uint _newTokensAmount) public override returns (bool) {
        totalSupply_ += _newTokensAmount;
        balances[msg.sender] += _newTokensAmount;
        return true;
}

    // Test

    // Hugo (creador del token): 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
    // Paco (Tenedor de tokens): 0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2
    // Luis (spender): 0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db
}