class ActivemqProps {

    public static final String GROUP_SPLIT_MARK = ":";

    public static String getTopicNew(Event event){<FILL_FUNCTION_BODY>}
}

        //new topic
        String topicNew;
        if (Utils.isEmpty(event.group())) {
            topicNew = event.topic();
        } else {
            topicNew = event.group() + ActivemqProps.GROUP_SPLIT_MARK + event.topic();
        }

        return topicNew;
    
<no_super_class>