Question
The Atbash cipher reflects the alphabet onto itself: 'a' maps to 'z', 'b' to 'y', 'c' to 'x', and so on (uppercase maps the same way, 'A' to 'Z'). Apply Atbash to a string, transforming every letter while preserving its case and leaving all other characters unchanged. For example, 'abc xyz' becomes 'zyx cba', and 'Hello!' becomes 'Svool!'. Applying the cipher twice returns the original text.
atbash(s: str) → str["abc xyz"]out"zyx cba"State your approach and its time/space complexity out loud before you optimize. Handle the edge cases (empty input, duplicates, overflow), and say why you chose this over the brute force. Green tests are the floor, not the grade.
Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.