Other Extrusions
This post is part of a course on geometric modeling at the Summer Liberal Arts Institute for Computer Science held at Carleton College in 2021.
As you have time, create other flat shape generators. Here are a few ideas:
- an arrow
 - your first initial
 - Pac-Man
 - an arch
 - an annulus (ring)
 
Feed their return values into your extrude function to produce solid models.