Nix Coding - Advent of Code 2019 Day 2 PART 2

We're doing some Nix programming. I had no idea there was a part 2 for each day! Someone told me (thank you!) so we're doing part 2 for the day 2.
Unfortunately we have no Isabel today, but we'll try to power through it!
Part 1: • Nix Coding - Advent of...
Advent of code: adventofcode.c...
Github for code in video: github.com/ell...
My series on Nix programming basics: • Learn Nix Programming
Donations are welcome at: ko-fi.com/elly...