* **Embrace idiomatic Rust:** Remove the unnecessary `return a+b;` statement; utilize expression-based returns for cleaner syntax. * **Normalize the entry point:** Change the unusual `pub fn main()` signature to the standard `fn main()` definition required for binary targets. * **Salt the code with robust documentation:** Introduce proper Rust documentation comments (`///`) above the `add` function for clarity and discoverability. * **Prepare for scaling potential:** If complexity grows, consider migrating the `add` function into a dedicated library module (`lib.rs`) for better crate organization.
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