Complete program flow

BadBuilder/Helpers/FileSystemHelper.cs

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+using BadBuilder.Models;
+
+namespace BadBuilder.Helpers
+{
+    internal static class FileSystemHelper
+    {
+        internal static async Task MirrorDirectoryAsync(string sourceDir, string destDir)
+        {
+            Directory.CreateDirectory(destDir);
+
+            string[] files = Directory.GetFiles(sourceDir);
+            foreach (var file in files)
+            {
+                string relativePath = Path.GetRelativePath(sourceDir, file);
+                string destFile = Path.Combine(destDir, relativePath);
+
+                Directory.CreateDirectory(Path.GetDirectoryName(destFile));
+
+                await CopyFileAsync(file, destFile);
+            }
+
+            string[] directories = Directory.GetDirectories(sourceDir);
+            foreach (var dir in directories)
+            {
+                var relativePath = Path.GetRelativePath(sourceDir, dir);
+                var destSubDir = Path.Combine(destDir, relativePath);
+
+                await MirrorDirectoryAsync(dir, destSubDir);
+            }
+        }
+
+        internal static async Task CopyFileAsync(string sourceFile, string destFile)
+        {
+            using (var sourceStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read))
+            using (var destStream = new FileStream(destFile, FileMode.Create, FileAccess.Write))
+                await sourceStream.CopyToAsync(destStream);
+        }
+    }
+}