* @param start1
   * @param end1
   * @param string2
   * @param start2
   * @param end2
   * @return int
   */
  public static int findMatchingPrefixLength(String string1, int start1, int end1, String string2, int start2, int end2) {
    if (end1 == Stella.NULL_INTEGER) {
      end1 = string1.length();
    }
    if (end2 == Stella.NULL_INTEGER) {
      end2 = string2.length();
    }
    return (Stella.helpFindMatchingPrefixLength(string1, start1, end1, string2, start2, end2));
  }