function rewardUser(uint256 _bountyId, address _user, uint256 _reward) external onlyOwner {
        Bounty storage bounty = bountyAt[_bountyId];
        require(bounty.remainingBounty >= _reward);
        bounty.remainingBounty -= _reward;

        bounty.ended = true;
        bounty.endTime = block.timestamp;
        
        _user.transfer(_reward);
        RewardStatus('Reward sent', bounty.id, _user, _reward);
    }