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Language/Type: Python recursion

Write a recursive function named star_string that accepts an integer parameter n and returns a string of stars (asterisks) 2n long (i.e., 2 to the nth power). For example:

Call Returns Reason
star_string(0) "*" 20 = 1
star_string(1) "**" 21 = 2
star_string(2) "****" 22 = 4
star_string(3) "********" 23 = 8
star_string(4) "****************" 24 = 16

You should throw a ValueError if passed a value less than 0.

Function: Write a Python function as described, not a complete program.

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