I changed the square function to using a for-loop instead of having to write the turtle function multiple times.

Checkpoint 1:
- It wasn't that difficult for me because I have a little prior coding experience.  I tried multiple different things and realized I could make the numbers in the list the same as the parameter so each side of the square would be that number.

square.py

@@ -1,17 +1,10 @@
 from turtle import *
 
 def square(side_length):
-    forward(side_length)
-    right(90)
-    forward(side_length)
-    right(90)
-    forward(side_length)
-    right(90)
-    forward(side_length)
-    right(90)
-
-sizes = [20, 40, 60, 80, 100]
-for size in sizes:
-    square(size)
+    sizes = [side_length, side_length, side_length, side_length]
+    for side in sizes:
+        forward(side)
+        right(90)
+square(100)
 input()