remove duplicate unlink function definition

flask_caching/backends/rediscache.py

@@ -203,19 +203,6 @@ def unlink(self, *keys):
             return self._write_client.unlink(*keys)
         return self._write_client.delete(*keys)
 
-    def unlink(self, *keys):
-        """when redis-py >= 3.0.0 and redis > 4, support this operation
-        """
-        if not keys:
-            return
-        if self.key_prefix:
-            keys = [self.key_prefix + key for key in keys]
-
-        unlink = getattr(self._write_client, "unlink", None)
-        if unlink is not None and callable(unlink):
-            return self._write_client.unlink(*keys)
-        return self._write_client.delete(*keys)
-
 
 class RedisSentinelCache(RedisCache):
     """Uses the Redis key-value store as a cache backend.