A complement project to this project

[haojie1]

Hello, I notice that this project just uses SDL2 library, but SDL2_Image and SDL2_ttf are also important in reality. So I create a new project using SDL2, SDL2_Image, and SDL2_ttf to improve the ability of this project by adding some game UI. I try to make my project simple enough so that any beginner can learn how to SDL2, SDL2_Image, and SDL2_ttf libraries to write some simple projects just like me. And as a beginner, my project must have some bugs, any suggestions are welcome. The address of my project is here.
Thank you!