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)
Construct a string from letters and counts
Flag largest magnitude swings as they occur
Split a string into chunks of specified length
How many days does the cat take to climb out of the hole?
'5*3' copy character 3 - five times
Lunar Arithmetic (Addition)
Find a real root of a quintic function without using roots function
Write c^3 as sum of two squares a^2+b^2
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