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/Program.cs

@@ -0,0 +1,152 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+using Animal;
+
+Console.WriteLine(new string(' ', 32) + "ANIMAL");
+Console.WriteLine(new string(' ', 15) + "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY");
+Console.WriteLine();
+Console.WriteLine();
+Console.WriteLine();
+Console.WriteLine("PLAY 'GUESS THE ANIMAL'");
+Console.WriteLine();
+Console.WriteLine("THINK OF AN ANIMAL AND THE COMPUTER WILL TRY TO GUESS IT.");
+Console.WriteLine();
+
+// Root of the question and answer tree
+Branch rootBranch = new Branch
+{
+    Text = "DOES IT SWIM",
+    Yes = new Branch { Text = "FISH" },
+    No = new Branch { Text = "BIRD" }
+};
+
+string[] TRUE_INPUTS = { "Y", "YES", "T", "TRUE" };
+string[] FALSE_INPUTS = { "N", "NO", "F", "FALSE" };
+
+
+while (true)
+{
+    MainGameLoop();
+}
+
+void MainGameLoop()
+{
+    // Wait fora YES or LIST command
+    string input = null;
+    while (true)
+    {
+        input = GetInput("ARE YOU THINKING OF AN ANIMAL");
+        if (IsInputListCommand(input))
+        {
+            ListKnownAnimals(rootBranch);
+        }
+        else if (IsInputYes(input))
+        {
+            break;
+        }
+    }
+
+    // Walk through the tree following the YES and NO
+    // branches based on user input.
+    Branch currentBranch = rootBranch;
+    while (!currentBranch.IsEnd)
+    {
+        while (true)
+        {
+            input = GetInput(currentBranch.Text);
+            if (IsInputYes(input))
+            {
+                currentBranch = currentBranch.Yes;
+                break;
+            }
+            else if (IsInputNo(input))
+            {
+                currentBranch = currentBranch.No;
+                break;
+            }
+        }
+    }
+
+    // Was the answer correct?
+    input = GetInput($"IS IT A {currentBranch.Text}");
+    if (IsInputYes(input))
+    {
+        Console.WriteLine("WHY NOT TRY ANOTHER ANIMAL?");
+        return;
+    }
+
+    // Interview the user to add a new question and answer
+    // branch to the tree
+    string newAnimal = GetInput("THE ANIMAL YOU WERE THINKING OF WAS A");
+    string newQuestion = GetInput($"PLEASE TYPE IN A QUESTION THAT WOULD DISTINGUISH A {newAnimal} FROM A {currentBranch.Text}");
+    string newAnswer = null;
+    while (true)
+    {
+        newAnswer = GetInput($"FOR A {newAnimal} THE ANSWER WOULD BE");
+        if (IsInputNo(newAnswer))
+        {
+            currentBranch.No = new Branch { Text = newAnimal };
+            currentBranch.Yes = new Branch { Text = currentBranch.Text };
+            currentBranch.Text = newQuestion;
+            break;
+        }
+        else if (IsInputYes(newAnswer))
+        {
+            currentBranch.Yes = new Branch { Text = newAnimal };
+            currentBranch.No = new Branch { Text = currentBranch.Text };
+            currentBranch.Text = newQuestion;
+            break;
+        }
+    }
+}
+
+string GetInput(string prompt)
+{
+    Console.Write($"{prompt}? ");
+    string result = Console.ReadLine();
+    if (string.IsNullOrWhiteSpace(result))
+    {
+        return GetInput(prompt);
+    }
+
+    return result.Trim().ToUpper();
+}
+
+bool IsInputYes(string input) => TRUE_INPUTS.Contains(input.ToUpperInvariant().Trim());
+
+bool IsInputNo(string input) => FALSE_INPUTS.Contains(input.ToUpperInvariant().Trim());
+
+bool IsInputListCommand(string input) => input.ToUpperInvariant().Trim() == "LIST";
+
+string[] GetKnownAnimals(Branch branch)
+{
+    List<string> result = new List<string>();
+    if (branch.IsEnd)
+    {
+        return new[] { branch.Text };
+    }
+    else
+    {
+        result.AddRange(GetKnownAnimals(branch.Yes));
+        result.AddRange(GetKnownAnimals(branch.No));
+        return result.ToArray();
+    }
+}
+
+void ListKnownAnimals(Branch branch)
+{
+    string[] animals = GetKnownAnimals(branch);
+    for (int x = 0; x < animals.Length; x++)
+    {
+        int column = (x % 4);
+        if (column == 0)
+        {
+            Console.WriteLine();
+        }
+
+        Console.Write(new string(' ', column == 0 ? 0 : 15) + animals[x]);
+    }
+    Console.WriteLine();
+}