Bing Dwen Dwen Mood Scale (Challenge)

# Introduction

In this challenge, you are tasked with creating a Bing Dwen Dwen mood scale that changes the mascot's expression based on a user's rating. The initial code provides the basic structure, and you need to add the necessary JavaScript functionality to achieve the desired effect. The goal is to update the Bing Dwen Dwen element's class names to reflect the corresponding mood, as specified in the provided table.