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)
I agree with Alfonso.
@Mehmet can you explain why?
Remove all the words that end with "ain"
Clean the List of Names
Energy of a photon
Calculate the area of a triangle between three points
Sum the entries of each column of a matrix which satisfy a logical condition.
Recaman Sequence - II
Simple return on investment
Bridge and Torch Problem - Minimum time
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