func: function split(address[] _to) public payable {
          uint256 _val = msg.value / _to.length;
          for (uint256 i=0; i < _to.length; i++) {
              _to[i].send(_val);
          }
  
          if (address(this).balance > 0) {
              msg.sender.transfer(address(this).balance);
          }
      }