private void encodeVote(final RLPOutput rlpOutput, final Vote vote) {
    final VoteType voteType = vote.isAuth() ? VoteType.ADD : VoteType.DROP;
    rlpOutput.startList();
    rlpOutput.writeBytes(vote.getRecipient());
    rlpOutput.writeByte(voteToValue.get(voteType));
    rlpOutput.endList();
  }
Create genesis extra data string.

@param validators the validators
@return the string
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/IbftExtraDataCodec.java