public static async Task AddByE2(Employee e2, List <Customer> listc)
 {
     foreach (var x in listc)
     {
         if (!Bank.acc.Contains(x.account))
         {
             Console.WriteLine(" CUSTOMER ADDED BY E2 ");
             await e2.AddAccountToBankServer(Bank.acc, Bank.dict, x.account);
         }
     }
 }
 public async Task CreateAccount(Account ac,Employee e)
 {
   await  e.AddAccountToBankServer(Bank.acc,Bank.dict, ac);
 }