public void handlePrepareMessage(final Prepare msg) {
    LOG.debug("Received a prepare message. round={}", roundState.getRoundIdentifier());
    peerIsPrepared(msg);
  }
Handle prepare message.

@param msg the msg
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/statemachine/IbftRound.java