Fix multiple typos, wrong var name, Memento out
Fix multiple typos, wrong var name, Memento out

The 'sentences' in the Memento are actually one run-on sentence. Suggest making each a separate sentence, as proposed, or using the word 'output' instead of sentence and removing full stops in calls to ->type().
dkbnguyen/common-design-patterns,dkbnguyen/common-design-patterns