One Edit Apart

The two secret codes are SUPPOSED to be identical — check whether exactly one position went wrong. 🔧

You get two words a and b of the same length. Print one edit if they differ in exactly one position, identical if they match everywhere, or too different.

Example:

Input: a = "crate", b = "brate" Output: one edit

Comparing position by position, only the first letter differs (c vs b) — exactly one mismatch.