The Progress of Postmodernism in Turkey and America by Examining Postmodernist Elements in Orhan Pamuk, Hasan Ali Toptaş, Paul Auster and Don Delillo (Kara Kitap, Benim Adım Kırmızı, Gölgesizler, Bin Hüzünlü Haz, City of Glass, The Locked Room, White Noise, Underworld)