My first time doing it.
I started in python, with a p1.py and p2.py in each dir. Just execute them.
On day 9, I decided to leanr elixir so I redid all of the initial python ones in elixir.
Instead of 2 files per day, I have a simple p.ex files with 2 modules (P1 and P2). Just edit the file to run one or the other
After day 10, I just did elixir.
On day 14, I started using the mix elixir toolchain, so the structure is a little different (this was so I could leverage dializer and a public sorted heap library).
Turns out that mix is great for leveraging the full elixir ecosystem, but not as good to just run a script (withouth the whole erlang OTP machinery).
I asked the community and eventyally using mix test seems to do the trick: https://elixirforum.com/t/mix-project-for-a-simple-script/60507
(same structure: one simple lib/p.ex with 2 modules P1 and P2, and a test which invokes P.start())
Well, why not rust you asked ? So I started redoing the first few days in rust...