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pragma solidity ^0.5.7;
// Vision.Network 100G Token -- is called "Voken" (upgraded)
// 
// More info:
//   https://vision.network
//   https://voken.io
//
// Contact us:
//   support@vision.network
//   support@voken.io
/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error.
 */
library SafeMath {
    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        c = a + b;
        assert(c >= a);
        return c;
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