Hey folks, the author here. I’m sorry, I haven’t seen this post until now. If you have urgent matters like this, it’s always better to reach out to me via Twitter or my personal website.
Regarding the issue: The GitHub repo shows the completed code, which is the final result after you followed the book until the end. The intention is that you follow the book’s instructions and write the code yourself step-by-step. The GitHub repo is intended to show you the final result in case you only wanna see that, or to give you some help if you get lost. But feel free to create your own repo and publish the intermediary steps as well 
Best, Peter