it's a bit unclear why padding is necessary in the first two test cases, where the number of characters (15) is already a multiple of the key size (3 or 5, respectively)
Add two numbers
Remove the small words from a list of words.
Rotate a Matrix by 90 degrees
Solving a quadratic equation
Derivative of polynomial
Lunar Arithmetic (Addition)
Duration of a trip in minutes
Repeat string n times - 2
unique with nan
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