Simplify Craps (C#) folder structure

29_Craps/csharp/Craps/CrapsGame.cs

@@ -0,0 +1,73 @@
+namespace Craps
+{
+    public enum Result
+    {
+        // It's not used in this program but it's often a good idea to include a "none"
+        // value in an enum so that you can set an instance of the enum to "invalid" or
+        // initialise it to "none of the valid values".
+        noResult,
+        naturalWin,
+        snakeEyesLoss,
+        naturalLoss,
+        pointLoss,
+        pointWin,
+    };
+
+    class CrapsGame
+    {
+        private readonly UserInterface ui;
+        private Dice dice1 = new Dice();
+        private Dice dice2 = new Dice();
+
+        public CrapsGame(ref UserInterface ui)
+        {
+            this.ui = ui;
+        }
+
+        public Result Play(out int diceRoll)
+        {
+            diceRoll = dice1.Roll() + dice2.Roll();
+
+            if (Win(diceRoll))
+            {
+                return Result.naturalWin;
+            }
+            else if (Lose(diceRoll))
+            {
+                return (diceRoll == 2) ? Result.snakeEyesLoss : Result.naturalLoss;
+            }
+            else
+            {
+                var point = diceRoll;
+                ui.Point(point);
+
+                while (true)
+                {
+                    var newRoll = dice1.Roll() + dice2.Roll();
+                    if (newRoll == point)
+                    {
+                        diceRoll = newRoll;
+                        return Result.pointWin;
+                    }
+                    else if (newRoll == 7)
+                    {
+                        diceRoll = newRoll;
+                        return Result.pointLoss;
+                    }
+
+                    ui.NoPoint(newRoll);
+                }
+            }
+        }
+
+        private bool Lose(int diceRoll)
+        {
+            return diceRoll == 2 || diceRoll == 3 || diceRoll == 12;
+        }
+
+        private bool Win(int diceRoll)
+        {
+            return diceRoll == 7 || diceRoll == 11;
+        }
+    }
+}