public void Subscribe()
{
Console.WriteLine($"Subscribing {_name} to {_subject.SubjectDetails()} ...");
Console.WriteLine("Subscribed successfully.");
}
public void Subscribe()
{
Console.WriteLine($"Subscribing {_user} to {_subject.SubjectDetails()} ...");
_subject.SubscribeObserver(this);
Console.WriteLine("Subscribed successfully");
}