code: private static IAtomContainer roundUpIfNeeded(IAtomContainer anon) {
          IChemObjectBuilder bldr = anon.getBuilder();
          if ((anon.getAtomCount() & 0x1) != 0) {
              IBond bond = anon.removeBond(anon.getBondCount() - 1);
              IAtom dummy = bldr.newInstance(IAtom.class, "C");
              anon.addAtom(dummy);
              anon.addBond(bldr.newInstance(IBond.class, bond.getBegin(), dummy, IBond.Order.SINGLE));
              anon.addBond(bldr.newInstance(IBond.class, dummy, bond.getEnd(), IBond.Order.SINGLE));
          }
          return anon;
      }
docs: Make a ring one atom bigger if it's of an odd size.
  
  @param anon ring
  @return 'anon' returned of chaining convenience