Paginate a slice in Rust
Rust interview exercise on Practical, difficulty 1 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write paginate(items, page, size) that returns the items on a 1-based page as a sub-slice. A page past the end is empty, and so is page 0 or size 0. Indexing out of range panics in Rust, so clamp first.
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