code: func (n *NetworkServerAPI) DeleteMulticastGroup(ctx context.Context, req *ns.DeleteMulticastGroupRequest) (*empty.Empty, error) {
  	var mgID uuid.UUID
  	copy(mgID[:], req.Id)
  
  	if err := storage.DeleteMulticastGroup(storage.DB(), mgID); err != nil {
  		return nil, errToRPCError(err)
  	}
  
  	return &empty.Empty{}, nil
  }
docs: // DeleteMulticastGroup deletes a multicast-group given an id.