docs: protected static String numerify(String numberString) {
          StringBuffer sb = new StringBuffer();
          for (int i = 0; i < numberString.length(); i++) {
              if (numberString.charAt(i) == '#') {
                  sb.append(RandomUtils.nextInt(10));
              } else {
                  sb.append(numberString.charAt(i));
              }
          }
  
          return sb.toString();
      }