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?
Number of Circles in a Number
Spherical radius given four points
Reverse CHECKBOX MATRIX with 69
Challenging perms function!
Check if the input is an interprime
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