 
     public mutating func shuffle() {
         deck.sort { (_, _) -> Bool in
-            return arc4random() % 2 == 0
+            #if os(Linux)
+                return random() % 2 == 0
+            #else
+                return arc4random() % 2 == 0
+            #endif
         }
     }
 

import Foundation

public struct Card: CustomStringConvertible {
    public enum Suit: Int {

        }
        return deckString
    }
}
