fixed using root directory instead of root path

code/Infrastructure/Verticals/DownloadClient/DownloadService.cs

@@ -1,4 +1,5 @@
 using System.Collections.Concurrent;
+using System.Diagnostics.CodeAnalysis;
 using System.Text.RegularExpressions;
 using Common.Configuration.ContentBlocker;
 using Common.Configuration.DownloadCleaner;
@@ -145,6 +146,26 @@ public abstract class DownloadService : IDownloadService
         return new();
     }
     
+    protected string? GetRootWithFirstDirectory(string path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+        {
+            return null;
+        }
+
+        string? root = Path.GetPathRoot(path);
+        
+        if (root is null)
+        {
+            return null;
+        }
+
+        string relativePath = path[root.Length..].TrimStart(Path.DirectorySeparatorChar);
+        string[] parts = relativePath.Split(Path.DirectorySeparatorChar, StringSplitOptions.RemoveEmptyEntries);
+
+        return parts.Length > 0 ? Path.Combine(root, parts[0]) : root;
+    }
+    
     private bool DownloadReachedRatio(double ratio, TimeSpan seedingTime, CleanCategory category)
     {
         if (category.MaxRatio < 0)