A group of friends have decided to start a secret society. The name will be the first letter of each of their names, sorted in alphabetical order.
Create a function that takes in an array of names and returns the name of the secret society.
societyName(["Adam", "Sarah", "Malcolm"]) ➞ "AMS"
societyName(["Harry", "Newt", "Luna", "Cho"]) ➞ "CHLN"
societyName(["Phoebe", "Chandler", "Rachel", "Ross", "Monica", "Joey"]) ➞ "CJMPRR"
The secret society's name should be entirely uppercased.