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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_caller(self, callers: List[str], function: str) -> str: """ Get the caller function from the provided function """

        is_next = False
        for c in callers:
            if is_next is True:
                return c
            if function == c:
                is_next = True