Double-Checking Solidity Ballots

function giveRightToVote(address voter) public {
        require(
            msg.sender == chairperson,
            "Only the chairperson can assign voting rights."
        );
        require(
            !voters[voter].voted,
            "The voter has used their ballot."
        );
        require(voters[voter].weight == 0);
        voters[voter].weight = 1;
    }