Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

10_Blackjack/csharp/Deck.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+
+namespace Blackjack
+{
+    public class Deck
+    {
+        private static readonly Random _random = new Random();
+
+        private readonly List<Card> _cards = new List<Card>(52);
+        private readonly List<Card> _discards = new List<Card>(52);
+
+        public Deck()
+        {
+            for (var index = 0; index < 12; index++)
+            {
+                for (var suit = 0; suit < 4; suit++)
+                {
+                    _discards.Add(new Card(index));
+                }
+            }
+            Reshuffle();
+        }
+
+        private void Reshuffle()
+        {
+            Console.WriteLine("Reshuffling");
+
+            _cards.AddRange(_discards);
+            _discards.Clear();
+
+            for (var index1 = _cards.Count - 1; index1 > 0; index1--)
+            {
+                var index2 = _random.Next(0, index1);
+                var swapCard = _cards[index1];
+                _cards[index1] = _cards[index2];
+                _cards[index2] = swapCard;
+            }
+        }
+
+        public Card DrawCard()
+        {
+            if (_cards.Count < 2)
+                Reshuffle();
+
+            var card = _cards[_cards.Count - 1];
+            _cards.RemoveAt(_cards.Count - 1);
+            return card;
+        }
+
+        public void Discard(IEnumerable<Card> cards)
+        {
+            _discards.AddRange(cards);
+        }
+    }
+}