Generate All Binary Strings

You are asked to create a recursive function to generate all the binary strings of length n.
Binary strings are sequences of 1's and 0's. For example, for n=3, the binary strings are 000, 001, 010, 011, 100, 101, 110, 111.
The input of the program is a single integer n that represents the length of the binary strings.
The output of the program should be all the binary strings of length n each on a new line in no particular order.
00 01 10 11


Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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