public void Subscrip(ISubscriptor subscriptor)
 {
     if (!ExistInstanceInSubscriptors(subscriptor))
     {
         _subscriptors.Add(subscriptor);
     }
     else
     {
         Console.WriteLine("Ya esta subscripto...");
     }
 }
 private bool ExistInstanceInSubscriptors(ISubscriptor subscriptor)
 {
     return(_subscriptors.Select(subs => subs.GetType()).Contains(subscriptor.GetType()));
 }