@Override public void undoRemove(Offer offer){
  offers.remove(offer);
  acceptedOffers.add(offer);
  undoOfferRemoveStream.onNext(offer);
}

@ Override public void undoRemove ( Offer offer ) { offers . remove ( offer ) ; acceptedOffers . add ( offer ) ; undoOfferRemoveStream . onNext ( offer ) ; }
undo offer removal add back to accepted offers list
