Challenge Overview
On October 29, 1971, the first email ever was sent, introducing the `username@domain` format we still use. Now, there are billions of email addresses.
On October 29, 1971, the first email ever was sent, introducing the username@domain format we still use. Now, there are billions of email addresses.
In this challenge, you are given a list of email addresses and need to sort them alphabetically by domain name first (the part after the @), and username second (the part before the @).
- Sorting should be case-insensitive.
- If more than one email has the same domain, sort them by their username.
- Return an array of the sorted addresses.
- Returned addresses should retain their original case.
For example, given ["[email protected]", "[email protected]", "[email protected]"], return ["[email protected]", "[email protected]", "[email protected]"].