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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 _handle_template_end(self):
 """Handle the end of a template at the head of the string."""

        if self._context & contexts.TEMPLATE_NAME:
            if not self._context & (contexts.HAS_TEXT | contexts.HAS_TEMPLATE):
                self._fail_route()
        elif self._context & contexts.TEMPLATE_PARAM_KEY:
            self._emit_all(self._pop())
        self._head += 1
        return self._pop()