public Optional<PreparedRoundArtifacts> constructPreparedRoundArtifacts() {
    if (isPrepared()) {
      return Optional.of(new PreparedRoundArtifacts(proposalMessage.get(), prepareMessages));
    }
    return Optional.empty();
  }
Construct prepared round artifacts.

@return the optional Prepared Round Artifacts
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/statemachine/RoundState.java