Hohoho

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)
         {

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)
         {

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; }

UserManager.cs

@@ -6,7 +6,7 @@ using System.Text;
 
 namespace First_week
 {
-    internal class UserManager
+    public class UserManager
     {
         public List <User> Registory = new();