Problem 61022. The Case of the Missing Prototype – Decode the Secret Note Found on the Desk to Reveal a Hidden Message

Ritik

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On the lab desk, you discover a short note filled with strange letters.
After examining it, you realize it’s written in a Caesar cipher, where each letter was shifted two positions forward in the alphabet.
To decode it, you must shift each letter two positions backward.
Assume the message only contains lowercase English letters and wraps around ('a' becomes 'y', 'b' becomes 'z').
Write a function that returns the decoded message string.