I'm newish to Rust and am confused about which project layout structure to use based on what I've been seeing in newer Rust projects. I've seen basically three setups:

1. Everything in /crates and using a workspace.
2. Main app in /src, everything else in /crates.
3. Main app in /src, everything else as a submodule inside of /src.

Most of the new projects seem to be using #1 now, even for what I would consider to be smaller projects. Is there a reason why one would want to use one of these approaches over the other?

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