X283: Recursion Programming Exercise: Decimal to Binary

For function 'decToBinary', write the missing parts of the recursion case. This function should return a string that stores the binary equivalent for int variable "num". Example: the binary equivalent of 13 may be found by repeatedly dividing 13 by 2. So, 13 in base 2 is represented by the string "1101".

Examples:

decToBinary(13) -> "1101"
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