Hey all, I was satisfied with my Haskell solutions so I wanted to share what I had!
Included functions are:

• fib_top_down_rec

• fib_bottom_up_iter

• fib_top_down_iter

• fib_top_down_iter_with_opt_1

• fib_top_down_iter_with_opt_2

• fib_top_down_iter_with_cache