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hash_string

Language/Type: Python recursion

Write a recursive function named hash_string that accepts an integer parameter k and returns a string of # (hash symbols) that is 2k characters long (i.e., 2 to the kth power). For example, the call of hash_string(3) returns "########". Throw an IllegalArgumentException if k is less than 0. Do not use loops you must use recursion.

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

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