public void CreateBankAccount(string name, int balance = 0)
        {
            var account = new CargoBankAccount(_index, name, balance);

            _accounts.Add(_index, account);
            _index += 1;
        }
 public bool TryGetBankAccount(int id, out CargoBankAccount account)
 {
     if (_accounts.TryGetValue(id, out var _account))
     {
         account = _account;
         return(true);
     }
     account = null;
     return(false);
 }