code: public static String getRandomString(final int stringLength) {
  
      StringBuilder stringBuilder = getStringBuild();
      for (int i = 0; i < stringLength; i++) {
        stringBuilder.append(getRandomAlphabetic());
      }
      return stringBuilder.toString();
    }
docs: Returns a random given length size alphabetic string.
  
  @param stringLength the length of the random string you want.
  @return a random given length size alphabetic string.