Allocation practice problems in Rust

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Title	Difficulty	Category	Tags
ASCII search without lowercase copies	Easy	Primitives
Build a byte index with one allocation	Easy	Primitives
Build a CSV record with one output buffer	Easy	Primitives
Build a report with a reusable string buffer	Medium	End-to-End
Chains versus loops: top-k, and a function that must not allocate	Medium	End-to-End
Cow: borrow until you have to own	Medium	Primitives
Delegate shape methods through an enum	Medium	End-to-End
Filter records without cloning their tags	Medium	End-to-End
Remove and return matching events with extract_if	Easy	Primitives
Reserve output space and report iterator size hints	Medium	End-to-End
Reusing buffers instead of allocating per iteration	Medium	Primitives
Sorting: sort vs sort_unstable vs sort_by_cached_key	Medium	End-to-End
Store and transpose a grid in one flat buffer	Medium	End-to-End
Where the allocations are: the counting allocator	Easy	Primitives
Zero-copy parsing: borrow, don't allocate	Medium	Primitives