diff --git a/project_name.Tests/UnitTest1.cs b/project_name.Tests/UnitTest1.cs
index d659ed6..2e6a555 100644
--- a/project_name.Tests/UnitTest1.cs
+++ b/project_name.Tests/UnitTest1.cs
@@ -1,6 +1,6 @@
 namespace project_name.Tests;
 
-using  project_name;
+using project_name;
 
 public class UnitTest1
 {
diff --git a/project_name/HelloWorldProvider.cs b/project_name/HelloWorldProvider.cs
index fc4406d..141d83a 100644
--- a/project_name/HelloWorldProvider.cs
+++ b/project_name/HelloWorldProvider.cs
@@ -2,9 +2,9 @@
 
 public class HelloWorldProvider
 {
-    public string GetHelloWorld(string name = null)
+    public string GetHelloWorld(string? name = null)
     {
-        if(string.IsNullOrEmpty(name))
+        if (string.IsNullOrEmpty(name))
         {
             return "Hello world!";
         }