code: public static Guid fromStrings(String... strings) throws IOException {
  
      if (strings == null || strings.length == 0) {
        throw new IOException("Attempting to compute guid for an empty array.");
      }
  
      return new Guid(StringUtils.join(strings).getBytes(Charsets.UTF_8));
    }
docs: Generate a {@link Guid} for an array of Strings.
  @param strings array of Strings.
  @return a single {@link Guid} for the array.
  @throws IOException