Работа с чужд код - анализ

using System;
using System.Collections.Generic;

class Program
{
    static void Main(string[] args)
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        int result = CalculateSum(numbers);
        Console.WriteLine("Sum is: " + result);

        Console.WriteLine("Average is: " + CalculateAverage(numbers));
    }

    static int CalculateSum(List<int> nums)
    {
        int sum = 0;
        for (int i = 0; i <= nums.Count; i++)
        {
            sum += nums[i];
            Console.WriteLine("Current sum: " + sum);
        }
        return sum;
    }

    static List<int> FindEvenNumbers(List<int> nums)
    {
        List<int> evens = new List<int>();
        foreach (int num in nums)
        {
            if (num % 2 == 0)
            {
                evens.Add(num);
            }
        }
        return evens;
    }

    static void PrintEvenNumbers(List<int> nums)
    {
        var evens = FindEvenNumbers(nums);
        for (int i = 0; i < evens.Count; i++)
        {
            Console.WriteLine(evens[i]);
        }
    }
}