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)
Duplicate each element of a vector.
Combinations without using nchoosek
Removing rows from a matrix is easy - but what about inserting rows?
Generate a vector like 1,2,2,3,3,3,4,4,4,4
~~~~~~~ WAVE ~~~~~~~~~
Find the biggest digit in a matrix
Decrypt a secret message!
Repeat string n times
Repeat string n times - 3
Calculate trends in time series
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