Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.4.25+commit.59dbf8f1.js&optimize=true&gist=

B.json

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Vo.json

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Votin.json

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Voting.json

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voting.sol

pragma solidity ^0.4.0;
contract Voting {
    
    enum Vote {ZERO, ONE, TWO}
    enum VoterStatus {Verified, Unverified}
    mapping(address => VoterStatus) private voters;
    Vote[] private votes;

    address chairperson;
    address[] board_members;

    /// Create a new voting with $(_board_members) different board members.
    function Voting() public {
        chairperson = msg.sender;
        //  board_members = [];
    }
    
    function _canEdit() 
        private
        constant
        returns (bool is_member) 
    {
        is_member = msg.sender==chairperson;
        for (uint8 i=0; i < board_members.length; i++){
            if (is_member==false && board_members[i]==msg.sender) {
                is_member = true;
                break;
            }
        }
    }

    /// Allow the board to verify addreses and allow them to vote again
    modifier onlyBoardMember() { // Modifier
        require(
            _canEdit() == true,
            "Only contract owners & board members can call this."
        );
        _;
    }
    
    /// Only addresses already approved by the board can vote
    modifier onlyVerifiedVoter(){
        require(
            voters[msg.sender] == VoterStatus.Verified,
            "Only verfierd addresses can vote."
        );
        _;
    }
    
    /// Give $(addr) the right to vote on this ballot.
    /// May only be called by $(chairperson or board member).
    function verify(address addr) public onlyBoardMember {
        voters[addr] = VoterStatus.Verified;
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toVote) public onlyVerifiedVoter {
        VoterStatus status = voters[msg.sender];
        if (status == VoterStatus.Verified){
            Vote v;
            if (toVote ==1) v = Vote.ONE;
            else if (toVote == 2) v = Vote.TWO;
            else if (toVote == 0) v = Vote.ZERO;
            else revert("Invalid vote");
            votes.push(v);
            voters[msg.sender] = VoterStatus.Unverified;
        }
    }

    function winningProposal() public constant returns (Vote _winningProposal) {
        uint8 ZEROVoteCount = 0;
        uint8 ONEVoteCount = 0;
        uint8 TWOVoteCount = 0;
        for (uint8 i = 0; i < votes.length; i++){
            Vote v = votes[i];
            if (v == Vote.ZERO) ZEROVoteCount +=1;
            else if (v == Vote.ONE) ONEVoteCount +=1;
            else TWOVoteCount += 1;
        }
        // what about equal outcome??
        if (ZEROVoteCount > ONEVoteCount && ZEROVoteCount > TWOVoteCount)
            _winningProposal = Vote.ZERO;
        else if (ONEVoteCount > ZEROVoteCount && ONEVoteCount > TWOVoteCount)
            _winningProposal = Vote.ONE;
        else
            _winningProposal = Vote.TWO;
    }
}