code: private void initPath(IAtomContainer molecule) {
          for (int i = 0; i < molecule.getAtomCount(); i++) {
              IAtom atom = molecule.getAtom(i);
              atom.setProperty(PATH, new ArrayList<IAtom>());
          }
      }
docs: initializes a path vector in every Atom of the given molecule
  
  @param   molecule  The given molecule