310. Rotate String

Given two strings s and goal, return True if and only if s can become goal after some number of shifts on s.

A shift on s consists of moving the leftmost character of s to the rightmost position.

For example, if s = "abcde", then it will be "bcdea" after one shift.

Example:
Input: s = "abcde", goal = "cdeab"
Output: True

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