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)
Remove the vowels
Back to basics 19 - character types
Rotate a Matrix by 90 degrees
Mirror Image matrix across anti-diagonal
Homemade: Control Charts
Duration of a trip in minutes
List all of the integer points in a bounded feasble region
Lunar Arithmetic (Addition)
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