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### Previous Fibonacci number

The sequence of Fibonacci numbers is defined as follows: $F_0 = 0 \\ F_1 = 1 \\ F_n = F_{n-1} + F_{n-2}$ Given a Fibonacci number, return the previous Fibonacci number in the sequence. You do not ...
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### Reverse hex cipher

Characters in strings are sometimes represented as their ASCII hexadecimal codes. Printable characters have two hex digits in their representation. Swapping those digits leads to another character, ...
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### Eh, codegolf shmodegolf

This challenge is about implementing Shm-reduplication, originating in Yiddish, where one takes a word, duplicates it, and replaces the first syllable in the second word with "Shm" in order ...
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