docs: public static Set<String> restoreSet(final String s, final String delim) {
          final Set<String> copytoSet = new HashSet<>();
  
          if (StringUtils.isEmptyString(s)) {
              return copytoSet;
          }
  
          final StringTokenizer st = new StringTokenizer(s, delim);
  
          while (st.hasMoreTokens()) {
              final String entry = st.nextToken();
              if (!StringUtils.isEmptyString(entry)) {
                  copytoSet.add(entry);
              }
          }
          return copytoSet;
      }