function timeBunny(uint32 _bunnyId) public view returns(bool can, uint timeleft) {
        uint _tmp = timeCost[_bunnyId].add(stepTimeSale);
        if (timeCost[_bunnyId] > 0 && block.timestamp >= _tmp) {
            can = true;
            timeleft = 0;
        } else { 
            can = false; 
            _tmp = _tmp.sub(block.timestamp);
            if (_tmp > 0) {
                timeleft = _tmp;
            } else {
                timeleft = 0;
            }
        } 
    }