code: private static void appendParam(final OmdbParameters params, final Param key, StringBuilder sb) {
          if (params.has(key)) {
              sb.append(DELIMITER_SUBSEQUENT).append(key.getValue()).append(params.get(key));
          }
      }
docs: Append a parameter and value to the URL line
  
  @param params The parameter list
  @param key The parameter to add
  @param sb The StringBuilder instance to use