Incapsulate some classes

src/AddIn/AddIn.cs

@@ -8,7 +8,7 @@ using System.Runtime.Caching;
 
 namespace RehauSku
 {
-    public enum ResponseOrder
+    enum ResponseOrder
     {
         Default,
         Relevance,
@@ -17,7 +17,7 @@ namespace RehauSku
         Series
     }
 
-    public class AddIn : IExcelAddIn
+    class AddIn : IExcelAddIn
     {
         public static HttpClient httpClient;
         public static MemoryCache memoryCache;

src/Assistant/RequestModifier.cs

@@ -5,7 +5,7 @@ using System.Text.RegularExpressions;
 
 namespace RehauSku.Assistant
 {
-    public static class RequestModifier
+    static class RequestModifier
     {
         public static string CleanRequest(this string input)
         {

src/Assistant/SkuAssist.cs

@@ -2,7 +2,7 @@
 
 namespace RehauSku.Assistant
 {
-    public enum ProductField
+    enum ProductField
     {
         Name,
         Id,

src/Assistant/StoreResponse.cs

@@ -2,17 +2,17 @@
 
 namespace RehauSku.Assistant
 {
-    public class StoreResponce
+    class StoreResponce
     {
         public Ecommerce Ecommerce { get; set; }
     }
 
-    public class Ecommerce
+    class Ecommerce
     {
         public List<Product> Impressions { get; set; }
     }
 
-    public class Product : IProduct
+    class Product : IProduct
     {
         public string Id { get; set; }
         public string Name { get; set; }