Santa's Phone Number Formatter 🎅📞

🎯 Task Write a JavaScript function that takes a 10-digit phone number as input and formats it into the following structure:

📋 Requirements Accept a 10-digit string as input. Validate that the input is exactly 10 digits and contains only numbers. Return the formatted phone number in the structure (000) 000-0000. If the input is invalid, throw an error indicating the issue.

📞 Example Santa’s contact example: Input: "8005551212" Output: "(800) 555-1212"

📂 Project Structure HTML file: Provides a simple form for users to enter a phone number. CSS file: Adds visual styling to make the interface user-friendly. JavaScript file: Contains the logic for validating and formatting the phone number.

🚀 How to Use Clone the repository to your local machine. Open the HTML file in your browser. Enter a 10-digit phone number in the provided input field. Click the "Format" button to view the formatted number or an error message 🎅✨.