code: public String randomLowerMaxLength(int minLength, int maxLength) {
          int range = maxLength - minLength;
          int randomLength = 0;
          if (range > 0) {
              randomLength = random(range);
          }
          return randomLower(minLength + randomLength);
      }
docs: Creates a random string consisting of lowercase letters.
  @param minLength minimum length of String to create.
  @param maxLength maximum length (non inclusive) of String to create.
  @return lowercase letters.