namespace Logistics;
public interface ITrackable
{
    string TrackingId { get; set; }
    void UpdateLocation(string newLocation);
}
public class FreightContainer : ITrackable
{
    public string TrackingId { get; set; } = string.Empty;
    public void UpdateLocation(string newLocation)
    {
        Console.WriteLine($"Container {TrackingId} is now at: {newLocation}");
    }
}