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pragma solidity ^ 0.4.15;
/**
*library name : SafeMath
*purpose : be the library for the smart contract for the swap between the godz and ether
*goal : to achieve the secure basic math operations
*/
library SafeMath {
  /*function name : mul*/
  /*purpose : be the funcion for safe multiplicate*/
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    /*assert(a == 0 || c / a == b);*/
    return c;
  }
  /*function name : div*/
  /*purpose : be the funcion for safe division*/
  function div(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a / b;
    return c;
  }
  /*function name : sub*/
  /*purpose : be the funcion for safe substract*/
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