Address.sol

pragma solidity ^0.4.24;

/**
 * Utility library of inline functions on addresses
 */
library Address {
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     */
    function sendValue(address  recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
    
        bool success = recipient.call.value(amount)("");
       
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}