1pragma solidity ^0.7.0;
 2
 3contract ERC20 {
 4    string public constant name = "";
 5    string public constant symbol = "";
 6    uint8 public constant decimals = 0;
 7
 8    /*
 9    function totalSupply() public constant returns (uint);
10    function balanceOf(address tokenOwner) public constant returns (uint balance);
11    function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
12    function transfer(address to, uint tokens) public returns (bool success);
13    function approve(address spender, uint tokens) public returns (bool success);
14    function transferFrom(address from, address to, uint tokens) public returns (bool success);
15
16    event Transfer(address indexed from, address indexed to, uint tokens);
17    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
18    */
19}