countvote.sol

    function vote(uint proposal) public {
        Voter storage sender = voters[msg.sender];
        require(sender.weight != 0, "Has no right to vote");
        require(!sender.voted, "Already voted.");
        sender.voted = true;
        sender.vote = proposal;
        proposals[proposal].voteCount += sender.weight;
    }

    // winningProposal must be executed before EndVote
    function countVote() public
            returns (uint winningProposal_)
            
    {
        require(
            block.timestamp > voteEndTime,
            "Vote not yet ended.");
        
        uint winningVoteCount = 0;
        for (uint p = 0; p < proposals.length; p++) {
            if (proposals[p].voteCount > winningVoteCount) {
                winningVoteCount = proposals[p].voteCount;
                winningProposal_ = p;
                
                decision = winningProposal_;
                ended = true;
            }
        }
    }