I'm participating in the adventofcode.com/2022 challenge.
Each day is a seperate crate in a workspace. The main crate is a CLI application that links with all other crates:
$ cargo run --release -- --help
Usage: aoc2022 [OPTIONS] --day <DAY>
Options:
--day <DAY> Day to run, or "all" for all days
--part <PART> Part to run, if not set both parts are run
--input <INPUT> Input file to use [default: input.txt]
-h, --help Print help information
-V, --version Print version information