diff --git a/CollectionUtils.cs b/CollectionUtils.cs
index a95f990..a5e309e 100644
--- a/CollectionUtils.cs
+++ b/CollectionUtils.cs
@@ -5,7 +5,7 @@ using System.Text;
 
 namespace First_week
 {
-    internal static class CollectionUtils
+    public static class CollectionUtils
     {
         public static bool IsNullOrEmpty<T>(this IEnumerable<T> collection)
         {
diff --git a/StringUtils.cs b/StringUtils.cs
index 11187ed..87a6986 100644
--- a/StringUtils.cs
+++ b/StringUtils.cs
@@ -1,6 +1,11 @@
-namespace First_week
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace First_week
 {
-    internal class StringUtils
+    public class StringUtils
     {
         public static bool IsPalindrome(string s)
         {
diff --git a/User.cs b/User.cs
index 42d2adb..831ae0c 100644
--- a/User.cs
+++ b/User.cs
@@ -7,7 +7,7 @@ using System.Text;
 
 namespace First_week
 {
-    internal class User
+    public class User
     {
         public Guid Id { get; }
         public string Name { get; private set; }
diff --git a/UserManager.cs b/UserManager.cs
index d93c17c..42302c3 100644
--- a/UserManager.cs
+++ b/UserManager.cs
@@ -6,7 +6,7 @@ using System.Text;
 
 namespace First_week
 {
-    internal class UserManager
+    public class UserManager
     {
         public List <User> Registory = new();