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•  contract ERC20
•    - function totalSupply()
•    - function balanceOf(address who)
•    - function allowance(address owner, add ...
•    - function transfer(address to, uint va ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•  contract YBlockFinance is ERC20 *
•    - function totalSupply()
•    - function balanceOf(address owner)
•    - function allowance(address owner, add ...
•    - function transfer(address to, uint256 ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•    - function ()

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/**
 *Submitted for verification at Etherscan.io on 2020-09-12
*/
pragma solidity >=0.4.22 <0.6.0;
contract ERC20 {
    function totalSupply() public view returns (uint supply);
    function balanceOf(address who) public view returns (uint value);
    function allowance(address owner, address spender) public view returns (uint remaining);
    function transfer(address to, uint value) public returns (bool ok);
    function transferFrom(address from, address to, uint value) public returns (bool ok);
    function approve(address spender, uint value) public returns (bool ok);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}
contract YBlockFinance is ERC20{
    uint8 public constant decimals = 18;
    uint256 initialSupply = 50000*10**uint256(decimals);
    string public constant name = "YBlock.Finance";
    string public constant symbol = "YBF";
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