Dear committee:

    After I had been told that there is a academic integrity problem in my code, I just started to recognized that I forgot to reference my code after reading the link in the file you send to me.  As a student who is not studying related major during my undergraduate course. The modules are quite difficult for me but I tired very hard and got pretty well marks. When I am starting the project I choose to build a chat room as a aim to study full stack web development. At first I want to built it in react.js so I spent lots of time in studying but find it is difficult for me to finish it in the rest of the time. Also, I was suffering urticaria and was easy to get allergy. Then I want to make it simple and start to make it throw express, socket.io, jQuery and mongoDB. I learned how to build a online chat room on a online course to study how to build it because the aim of my project is to research and learn the process of building online chat room so I thought learning to built a online chat room can be part of my project. Then I add some functions with mongoDB in my applications after learned and research the process of building online chat room.I feel so sorry about that and hope for lenient treatment, for I really don't know it should be referenced.

Yours Dongxiao