private void AddZerosToAccount(Account account, Account relativeAccount, int numberOfZeros)
        {

            if (relativeAccount.Level == 4)
            {
                account.AccountNumber = account.AccountNumber.Substring(0, 4) + "".PadRight(numberOfZeros, '0') +
                                        account.AccountNumber.Substring(4);
            }
            else
            {
                account.AccountNumber = account.AccountNumber.Substring(0, 5) + "".PadRight(numberOfZeros, '0') +
                                        account.AccountNumber.Substring(5);
            }
        }

        private void AddZerosToAccount(Account account, int relativeAccountLevel, int numberOfZeros)
        {
            string padding = String.Empty.PadRight(numberOfZeros, '0');
            int length = relativeAccountLevel == 4 ? 4 : 5;

            string head = account.AccountNumber.Substring(0, length);
            string tail = account.AccountNumber.Substring(length);

            account.AccountNumber = head + padding + tail;
        }