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)
Determine whether a vector is monotonically increasing
Back to basics 25 - Valid variable names
Piecewise linear interpolation
Find last zero for each column
Van Eck's Sequence's nth member
Simple return on investment
Go back n times
Digit concentration in Champernowne's constant
Decrypt a secret message!
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