code: def generate_defect_structure(self, supercell=(1, 1, 1)):
          
          defect_structure = self.bulk_structure.copy()
          defect_structure.make_supercell(supercell)
  
          # consider modifying velocity property to make sure defect site is decorated
          # consistently with bulk structure for final defect_structure
          defect_properties = self.site.properties.copy()
          if ('velocities' in self.bulk_structure.site_properties) and \
              'velocities' not in defect_properties:
              if all( vel == self.bulk_structure.site_properties['velocities'][0]
                      for vel in self.bulk_structure.site_properties['velocities']):
                  defect_properties['velocities'] = self.bulk_structure.site_properties['velocities'][0]
              else:
                  raise ValueError("No velocity property specified for defect site and "
                                   "bulk_structure velocities are not homogeneous. Please specify this "
                                   "property within the initialized defect_site object.")
  
          #create a trivial defect structure to find where supercell transformation moves the defect site
          site_properties_for_fake_struct = {prop: [val] for prop,val in defect_properties.items()}
          struct_for_defect_site = Structure( self.bulk_structure.copy().lattice,
                                               [self.site.specie],
                                               [self.site.frac_coords],
                                               to_unit_cell=True,
                                               site_properties = site_properties_for_fake_struct)
          struct_for_defect_site.make_supercell(supercell)
          defect_site = struct_for_defect_site[0]
  
          defect_structure.append(self.site.specie.symbol, defect_site.coords, coords_are_cartesian=True,
                                  properties = defect_site.properties)
          defect_structure.set_charge(self.charge)
          return defect_structure
docs: Returns Defective Interstitial structure, decorated with charge
          Args:
              supercell (int, [3x1], or [[]] (3x3)): supercell integer, vector, or scaling matrix