More practice with rust.
Code that looks half-decent is heavily "inspired" by solutions found at https://github.com/Bogdanp/awesome-advent-of-code#rust and this person in particular https://github.com/ephemient/aoc2022/tree/main/rs who seems to know what they're doing.
If it looks like garbage, I probably wrote it mostly myself.
Set your session cookie as the SESSION variable in a .env file at the project root or load it into your environment.
cargo run <DAY>cargo test <DAY>