To use:
1. Get session key
2. Put session key in the .session file in the root of the project. The file should only contain the session key, nothing else
3. This project uses the aoc-cli tool, so you need to install it with `cargo install aoc-cli`
4. You can either run `cargo scaffold` to generate a template for a new day and autimatically download the input file, or you can run `cargo solve` to run the code for the current day.