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Write a function rotate(s, n) that has one string parameter s followed by a positive integer parameter n. it returns a rotated string such that the last n characters have been moved to the beginning. if the string is empty or a single character, the function should simply return the string unchanged. assume that n is less than or equal to the length of s and that n is a positive integer. for example: rotate('abcdefgh',3) returns efgabcde'

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