Totals by status in Rust
Rust interview exercise on Structs & Enums, difficulty 2 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write totals_by_status(orders) that sums order totals into a Totals struct, one field per Status. A struct, unlike a map, guarantees all three totals exist, and Default gives you the zeros.
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