URL Builder

Problem Overview

• Build a full URL by combining a baseURL and endpoint, adding ?, and appending query parameters as key=value joined by &, with page (if present) placed last; otherwise keep the given order.
• Inputs: baseURL (String), endpoint (String), params (list of key–value pairs). Output: a complete URL String.
• Domain: constructing reliable web and API request URLs in real-world applications.
• From TikTok interviews; a practical coding interview problem and common interview question.