Update Program.cs

Signed-off-by: Lev Rusanov <30170278+JDM170@users.noreply.github.com>

Program.cs

@@ -20,17 +20,28 @@ namespace DuplicateFinder
             }
         }
 
-        static void Main(string[] args)
+        static string GetValidDirectoryPath()
         {
             Console.Write("Enter directory path: ");
-            string directoryPath = Console.ReadLine();
+            string path = Console.ReadLine().Trim();
+            if (!Directory.Exists(path))
+            {
+                Console.WriteLine("The directory does not exist. Please try again.");
+                return GetValidDirectoryPath();
+            }
+            Console.WriteLine();
+            return path;
+        }
+
+        static void Main(string[] args)
+        {
+            string directoryPath = GetValidDirectoryPath();
 
             Dictionary<string, List<string>> fileHashes = new Dictionary<string, List<string>>();
-
             foreach (string filePath in Directory.EnumerateFiles(directoryPath, "*.*", SearchOption.AllDirectories))
             {
+                Console.WriteLine("Calculating hash: " + filePath);
                 string hash = CalculateSha1(filePath);
-
                 if (fileHashes.ContainsKey(hash))
                 {
                     fileHashes[hash].Add(filePath);
@@ -41,16 +52,24 @@ namespace DuplicateFinder
                 }
             }
 
-            Console.WriteLine("\nDuplicate files:");
-            foreach (var group in fileHashes.Values.Where(v => v.Count > 1))
+            if (fileHashes.Values.Count(v => v.Count > 1) > 1)
             {
-                foreach (var filePath in group)
+                Console.WriteLine("\nDuplicate files:");
+                foreach (List<string> group in fileHashes.Values.Where(v => v.Count > 1))
                 {
-                    Console.WriteLine(filePath);
+                    foreach (string filePath in group)
+                    {
+                        Console.WriteLine(filePath);
+                    }
+                    Console.WriteLine();
                 }
-                Console.WriteLine();
+            }
+            else
+            {
+                Console.WriteLine("\nDuplicates not find.");
             }
 
+            Console.WriteLine("Press any key to exit...");
             Console.ReadKey();
         }
     }