Crea una función para extraer el nombre del subreddit de su URL.
subReddit("https://www.reddit.com/r/funny/") ➞ "funny"
subReddit("https://www.reddit.com/r/relationships/") ➞ "relationships"
subReddit("https://www.reddit.com/r/mildlyinteresting/") ➞ "mildlyinteresting"N/A