code: public static void registerHelpers(ConfigurationExtensionBuilder builder, Map<String, Helper> helpers) {
          Checker.checkArgumentsNotNull(builder, helpers);
          for (Entry<String, Helper> entry : helpers.entrySet()) {
              registerHelper(builder, entry.getKey(), entry.getValue());
          }
      }
docs: Register helper and do nothing if a helper with the same name is already registered.
  
  @param builder
  @param helpers