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contracts...TamiCoin.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.8.3;

// IRC20 interface commonly usage for create new ethereum tokens.
// Custom tokens running on the Ethereum virtual machine must implement this or some other interface.

interface IRC20 {
    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);
}

Interface for create a custom token RC20.