gistfile1.rb

    if item.name != 'Aged Brie' && item.name != 'Backstage passes to a TAFKAL80ETC concert'
      if item.quality > 0
        if item.name != 'Sulfuras, Hand of Ragnaros'
          item.quality -= 1
        end
      end
    else
      if item.quality < 50
        item.quality += 1
        if item.name == 'Backstage passes to a TAFKAL80ETC concert'
          if item.sell_in < 11
            if item.quality < 50
              item.quality += 1
            end
          end
          if item.sell_in < 6
            if item.quality < 50
              item.quality += 1
            end
          end
        end
      end
    end
    if item.name != 'Sulfuras, Hand of Ragnaros'
      item.sell_in -= 1
    end
    if item.sell_in < 0
      if item.name != "Aged Brie"
        if item.name != 'Backstage passes to a TAFKAL80ETC concert'
          if item.quality > 0
            if item.name != 'Sulfuras, Hand of Ragnaros'
              item.quality -= 1
            end
          end
        else
          item.quality = item.quality - item.quality
        end
      else
        if item.quality < 50
          item.quality += 1
        end
      end
    end