kostrse

public static class LinkedListExtensions
{
    public static T Last<T>(this IEnumerable<T> items, int index)
    {
        T[] keepItems = new T[index];

        int position = 0;
        int count = 0;

        foreach (var item in items)

kostrse

private static bool CheckAccountNumber(string bankNumber, string accountNumber)
{
    int[] mask = new[] { 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7, 1 };

    if (bankNumber.Length < 3)
    {
        Console.WriteLine("Incorrect bank number.");
        return false;
    }