Challenge: Levenshtein distance for quiz-like web sites and alike

I found this great algorithm, which can be used for quiz-like inputs where you want to check if the person knows the answer but don't care about spelling or accidental errors without hard coding like .trim() method in js. It is pretty simple but yields great results. It can be used for plagiarism detection and what not.
Here is the [wikipedia page](https://en.wikipedia.org/wiki/Levenshtein_distance). I think it would be kinda fun to see this explained.

Start with the issue description and its linked Wikipedia page on Levenshtein distance. Define the intended explanation for quiz-like inputs, including how spelling errors and plagiarism detection relate to the algorithm; done should be a clear, publishable topic proposal or lesson.

Scritto dal modello di indicizzazione a partire dal testo della issue.