Find code that adds one 0 to each sequence of 0 in a string (composed with only 0 or 1).
For example:
'1010' -> '100100' '0110' -> '001100' '1000' -> '10000' '1111' -> '1111'
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Didn't really understand the problem right from reading the task itself, but from reading the test cases. Really fun problem though. First time I used regexprep function, so I learned a lot!