dhcsofficial

### Keybase proof

I hereby claim:

  * I am dhcsofficial on github.
  * I am akashark (https://keybase.io/akashark) on keybase.
  * I have a public key ASAABMcSXQiLj4agXZym3FiD5AT5H0P6_19s-UbJc7N9xgo

To claim this, I am signing this object:

dhcsofficial

pragma solidity ^0.4.25;

library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant returns (uint256) {

dhcsofficial

pragma solidity ^0.4.25;

library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant returns (uint256) {