docs: public static String join(String delimiter, String wrap, Iterable<?> objs) {
          Iterator<?> iter = objs.iterator();
          if (!iter.hasNext()) {
              return "";
          }
          StringBuilder buffer = new StringBuilder();
          buffer.append(wrap).append(iter.next()).append(wrap);
          while (iter.hasNext()) {
              buffer.append(delimiter).append(wrap).append(iter.next()).append(wrap);
          }
          return buffer.toString();
      }