Refactor method access modifier and fix method casing

Changed SetPriceCode method to private in Movie class to encapsulate it. Corrected the casing of the Main and Stop methods in GreetingServer to adhere to C# naming conventions. This enhances code encapsulation and readability while maintaining consistency.

src/Marsen.NetCore.Dojo/Books/Refactoring_Improving_The_Design_of_Existing_Code/Movie.cs

@@ -16,7 +16,7 @@ public Movie(string title, MoveType moveType)
         SetPriceCode(moveType);
     }
 
-    public void SetPriceCode(MoveType arg)
+    private void SetPriceCode(MoveType arg)
     {
         switch (arg)
         {

src/Marsen.NetCore.Dojo/Classes/GOOS/GreetingServer.cs

@@ -9,7 +9,7 @@ public static class GreetingServer
 {
     private static HttpListener _httpListener;
 
-    public static void main(params string[] args)
+    public static void Main(params string[] args)
     {
         _httpListener = new HttpListener();
         _httpListener.Prefixes.Add(SampleUri);
@@ -33,7 +33,7 @@ private static void GetContext(IAsyncResult ar)
         }
     }
 
-    public static void stop()
+    public static void Stop()
     {
         _httpListener.Stop();
     }

test/Marsen.NetCore.Dojo.Integration.Tests/Classes/GOOS/GreetingServerE2ETest.cs

@@ -64,12 +64,12 @@ public class InitializationTest : IDisposable
     {
         protected InitializationTest()
         {
-            GreetingServer.main();
+            GreetingServer.Main();
         }
 
         public void Dispose()
         {
-            GreetingServer.stop();
+            GreetingServer.Stop();
             SystemDateTime.Reset();
         }
     }