Removed spaces from top-level directory names.

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

03_Animal/csharp/Branch.cs

@@ -0,0 +1,18 @@
+namespace Animal
+{
+    public class Branch
+    {
+        public string Text { get; set; }
+
+        public bool IsEnd => Yes == null && No == null;
+
+        public Branch Yes { get; set; }
+
+        public Branch No { get; set; }
+
+        public override string ToString()
+        {
+            return $"{Text} : IsEnd {IsEnd}";
+        }
+    }
+}