use adapter design pattern to solve question

Implement the following in java, write all classes need in the following application, in addition to demo class that contains main method to test your application

A customer has already account with a particular Website (Mawdoo3). This account holds all data related to the user such as name, phone num, email. Mawdoo3 site applies a new button to validate your phone num, but they need to not affect the existing application. Instead, they need to build adapter that can access validate phone num service and make it available for Mawdoo3 customers. When a customer needs to perform a validate phone num, the account cannot access directly Mawdoo3 account detail, but instead it can access adapter to complete the transaction.

Validation phone number process includes the following

1. There must be two underscores (_) in the phone num

2. Number of characters including underscores equal 13.

a. if the customers phone num is valid, the new service will return valid phone num and if not, the service will return not valid

b. The application will print the returned message to the user