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)
Swap the first and last columns
Poker Series 01: isStraightFlush
Is the Point in a Triangle?
Max index of 3D array
frame of the matrix
Check if the input is a strong prime
Cryptography with A Square Matrix : Decoding
Write out numbers in words
Delete the rows in the middle
Repeat string n times
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