docs: public static Message receiptMessageFor(Message messageWithReceiptRequest) {
          String stanzaId = messageWithReceiptRequest.getStanzaId();
          if (StringUtils.isNullOrEmpty(stanzaId)) {
              return null;
          }
          Message message = new Message(messageWithReceiptRequest.getFrom(), messageWithReceiptRequest.getType());
          message.addExtension(new DeliveryReceipt(stanzaId));
          return message;
      }