code: String computeTopic(JsTopicName jsTopicName, String topic) {
  		StringBuilder result = new StringBuilder();
  		if (!jsTopicName.prefix().isEmpty()) {
  			result.append(jsTopicName.prefix()).append(Constants.Topic.COLON);
  		}
  		result.append(topic);
  		if (!jsTopicName.postfix().isEmpty()) {
  			result.append(Constants.Topic.COLON).append(jsTopicName.postfix());
  		}
  		return result.toString();
  	}
docs: Compute full topicname from jsTopicName.prefix, topic and jsTopicName.postfix
  @param jsTopicName
  @param topic
  @return