numUniqueEmails = function (emails) {
	const uniqEmails = new Set();

	for (let email of emails) {
		let cleanEmail = "";
		for (let i = 0; i < email.length; i++) {
			if (email[i] === "@") {
				cleanEmail += email.slice(i);
				break;
			} else if (email[i] === "+") {
				while (email[i] !== "@") i++;
				cleanEmail += email.slice(i);
				break;
			} else if (email[i] !== ".") {
				cleanEmail += email[i];
			}
		}

		uniqEmails.add(cleanEmail);
	}

	return uniqEmails.size;
}
Manual Solution
Hash Set - Unique Emails
Time O(N * K) | Space O(N)
https://leetcode.com/problems/unique-email-addresses
@param {string[]} emails
@return {number}