function checkRelease(ERC20 token) public {
       uint _unRelease = 0;
       
        for(uint i = 0; i < _amount.length; i++) {
            _unRelease = _unRelease.add(_amount[i]); 
        }
        if(_unRelease==0 && block.timestamp >= _unlocktime ){
             token.transfer(owner,token.balanceOf(this));
        }
        
  }