code: def shift_to_origin(self, **kwargs):
          
          self.coordinates = shift_com(self.elements, self.coordinates, **kwargs)
          self._update()
docs: Shift a molecule to Origin.
  
          This function takes the molecule's coordinates and adjust them so that
          the centre of mass of the molecule coincides with the origin of the
          coordinate system.
  
          Returns
          -------
          None : :class:`NoneType`