[Amazon] Rearrange String

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Given a string str and an integer k, you need to rearrange the string in a way that the same characters must be at least k distance away. If not possible, return "".



str = "aabb", k = 2


You can return either "abab" or "baba". 



str = "aaaa", k = 2


return ""


Solve the problem:

def rearrangeString(str, k):

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