Many online forms request a user's phone number including the area code. We need to store the phone number in our user database. Unfortunately, people like to enter their phone number in a particular way that doesn't match the way that we'd like to store it. We will let the user enter the phone number how they like and our method will convert it to the way that we'd like to store it.

Our database wants the phone number formatted like this:
(xxx) xxx-xxxx
where each x is a numeric digit.
Our users will enter a 10 digit number like this:
xxxxxxxxxx
Your method should convert the string of numbers into a new string that is formatted properly for our database.

NOTE: The user's phone number is a String of numeric digits, not an actual number!