Inspired by Problem 1827 by Andrew Newell.
Write a function that has the following property:
The test suite is simple. The goal is just to obtain a general method.
Encode Roman Numerals
Distance walked 2D
Determine the number of odd integers in a vector
Matrix multiplication across rows
Decrypt the cypher using XOR encryption (for beginners)
BLOCK x3 (Version 3)
Add more zeros
Sum of big primes without primes
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