code02.cs

using system;
using System.Collections.Generic;
    IEnumerator<string> colors = new List<string> {"blue", "red", "green"}.GetEnumerator();
foreach (var colors in colors)
{
    Console.WriteLine($"{color} is my favorite color");
}
public static class Extensions
{
    public static IEnumerator<T> GetEnumerator<T>(this IEnumerator<T> enumerator) => enumerator;
}