You have recently been hired as a software developer at DataInsights Ltd$.,$ a leading company in the field of software development. The company is working on a new project for e$-$commerce company named Temu that involves processing large datasets efficiently. Your role is crucial in designing and implementing a data processing application for e$-$commerce platform that caters to a diverse range of products such that the application adheres to SOLID development principles and follows clean coding techniques. The client provided you with the following requirements:

The real$-$time notification system provides users with information regarding product availability and price changes. For this part, we have implemented three classes.

$1.$ Company class includes the following members:

$$ Name with a constant value of $$Temu$.$

$$ Registered clients for the product$$s notification service.

$$ A method responsible for handling notifications to all clients by sending a message describing the change.

$$ Subscribe method that adds a new registered client.

$$ Unsubscribe method that removes a pre$-$registered client.

$1.$ Client class includes the following members:

$$ Name

$$ Address

$$ Phone Number

$$ A method that takes a message as a parameter and prints it$.$

$1.$ Product class includes the following members:

$$ Type

$$ Size

$$ Color

Products have a type of $($men$,$ kids, women$).$