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)
Reverse the Words (not letters) of a String
Justify the character string in center with proportional fonts
Edges of a n-dimensional Hypercube
Divide elements by sum of elements
Homemade: Control Charts
Integer to boolean
unique with nan
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