code: def make_supercell(system, matrix, supercell=[1, 1, 1]):
      
      user_supercell = [[1, supercell[0]], [1, supercell[1]], [1, supercell[1]]]
      system = create_supercell(system, matrix, supercell=user_supercell)
      return MolecularSystem.load_system(system)
docs: Return a supercell.
  
      This functions takes the input unitcell and creates a supercell of it that
      is returned as a new :class:`pywindow.molecular.MolecularSystem`.
  
      Parameters
      ----------
      system : :attr:`pywindow.molecular.MolecularSystem.system`
          The unit cell for creation of the supercell
  
      matrix : :class:`numpy.array`
          The unit cell parameters in form of a lattice.
  
      supercell : :class:`list`, optional
          A list that specifies the size of the supercell in the a, b and c
          direction. (default=[1, 1, 1])
  
      Returns
      -------
      :class:`pywindow.molecular.MolecularSystem`
          Returns the created supercell as a new :class:`MolecularSystem`.