code: public static String mergeSeq(final String first, final String second) {
      return mergeSeq(first, second, DELIMITER);
    }
docs: <p>
  mergeSeq.
  </p>
  
  @param first
  a {@link java.lang.String} object.
  @param second
  a {@link java.lang.String} object.
  @return a {@link java.lang.String} object.