code: public static Set<String> parseMdcTags(String mdcTagsString) {
          if (isNullOrEmpty(mdcTagsString)) {
              return Collections.emptySet();
          }
  
          return new HashSet<>(Arrays.asList(mdcTagsString.split(",")));
      }
docs: Parses the provided Strings into a Set of Strings.
  
  @param mdcTagsString comma-delimited tags
  @return Set of Strings representing mdc tags