Here's a 22-line Elixir script that spins up a webserver: https://hexdocs.pm/plug/readme.html#hello-world-request-resp...

There's another single-file example on that page that shows how to implement routing. The reason AI probably gave you a more fleshed out project structure is because people typically default to using Phoenix (Elixir's equivalent of Rails) instead of going for something simpler like Plug.

After getting a result you didn't like with AI, did you try refining your prompt to state that you wanted a single-file structure?