code: public void removeReaction(Emoji emoji, boolean you) {
          Optional<Reaction> reaction = reactions.stream().filter(r -> emoji.equalsEmoji(r.getEmoji())).findAny();
          reaction.ifPresent(r -> ((ReactionImpl) r).decrementCount(you));
          reactions.removeIf(r -> r.getCount() <= 0);
      }
docs: Removes an emoji from the list of reactions.
  
  @param emoji The emoji.
  @param you Whether this reaction is used by you or not.