public Fibo()
        {
            Range = 5;
        }
        public int Range { get; set; }
        public List<int> GetFiboSeries()
        {
            List<int> fiboSeries = new();
            int a = 0, b = 1, c = 0;
            if (Range == 1)
            {
                fiboSeries.Add(0);
                return fiboSeries;
            }
                fiboSeries.Add(0);
                fiboSeries.Add(1);
            for (int i = 2; i < Range; i++)
            {
                c = a + b;
                fiboSeries.Add(c);
                a = b;
                b = c;
            }
            return fiboSeries;
        }