put StreamToString to extensions

Azaion.Test/SecurityTest.cs

@@ -1,5 +1,6 @@
 using System.Security.Cryptography;
 using System.Text;
+using Azaion.Common.Extensions;
 using Azaion.Services;
 using FluentAssertions;
 using Newtonsoft.Json;
@@ -27,7 +28,7 @@ public class SecurityTest
         await encryptedStream.DecryptTo(decryptedStream, key);
         encryptedStream.Close();
 
-        var str = StreamToString(decryptedStream);
+        var str = decryptedStream.ConvertToString();
         str.Should().Be(testString);
     }
 
@@ -91,17 +92,9 @@ public class SecurityTest
         return stream;
     }
 
-    private static string StreamToString(Stream stream)
-    {
-        stream.Position = 0;
-        using var reader = new StreamReader(stream, Encoding.UTF8);
-        return reader.ReadToEnd();
-    }
-
     private static Stream StringToStream(string src)
     {
         var byteArray = Encoding.UTF8.GetBytes(src);
         return new MemoryStream(byteArray);
     }
-
 }