using GildedRose.Abstraction; using GildedRoseKata; namespace GildedRose.Models { public class AgedBrie : Item, ICustomMethod { public int SellDaysGone { get; set; } public void UpdateQuality() { if (this.Quality < 51) { this.Quality++; } } public void UpdateSellIn() { if (this.SellIn > 0) this.SellIn--; } } }