code: def move(self, source, dest):
          
  
          source = self._item_path(source)
          dest = self._item_path(dest)
  
          # Check that source exists.
          if not (contains_array(self._store, source) or
                  contains_group(self._store, source)):
              raise ValueError('The source, "%s", does not exist.' % source)
          if contains_array(self._store, dest) or contains_group(self._store, dest):
              raise ValueError('The dest, "%s", already exists.' % dest)
  
          # Ensure groups needed for `dest` exist.
          if "/" in dest:
              self.require_group("/" + dest.rsplit("/", 1)[0])
  
          self._write_op(self._move_nosync, source, dest)
docs: Move contents from one path to another relative to the Group.
  
          Parameters
          ----------
          source : string
              Name or path to a Zarr object to move.
          dest : string
              New name or path of the Zarr object.