The user-input genre type can't be saved

[Celineyaa]

When I add a new genre type and exit the program, after I open the program again, the user-added genre type can be seen in the book object that previously updated to the user-added genre, but can't be shown in the current program's set-genre options. Current output:

set-genre 2
Available genres:

1. Fiction
2. Non-Fiction
3. Mystery
4. Science Fiction
5. Fantasy
6. Add a new genre

expected output:
set-genre 2
Available genres:

1. Fiction
2. Non-Fiction
3. Mystery
4. Science Fiction
5. Fantasy
6. happy dogs
7. Add a new genre

I think it will be better to save the user created genre type in the system.