diff --git a/Program.cs b/Program.cs
new file mode 100644
index 0000000..bc6b15f
--- /dev/null
+++ b/Program.cs
@@ -0,0 +1,12 @@
+using StringProcessingApp.Views;
+
+namespace StringProcessingApp
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            new StringView().Start();
+        }
+    }
+}
diff --git a/StringService.cs b/StringService.cs
new file mode 100644
index 0000000..48bbaf3
--- /dev/null
+++ b/StringService.cs
@@ -0,0 +1,59 @@
+namespace StringProcessingApp.Services
+{
+    public class StringService
+    {
+        private string _current = string.Empty;
+        private string _backup = string.Empty;
+
+        public void LoadText(string input)
+        {
+            _current = input;
+            _backup = input;
+        }
+
+        public string Display()
+        {
+            return _current;
+        }
+
+        public void MakeUpper()
+        {
+            _current = _current.ToUpper();
+        }
+
+        public void MakeLower()
+        {
+            _current = _current.ToLower();
+        }
+
+        public int GetLength()
+        {
+            return _current.Length;
+        }
+
+        public bool HasWord(string value)
+        {
+            return _current.Contains(value);
+        }
+
+        public void ChangeWord(string oldValue, string newValue)
+        {
+            _current = _current.Replace(oldValue, newValue);
+        }
+
+        public void GetPart(int start, int count)
+        {
+            _current = _current.Substring(start, count);
+        }
+
+        public void CleanSpaces()
+        {
+            _current = _current.Trim();
+        }
+
+        public void Restore()
+        {
+            _current = _backup;
+        }
+    }
+}
diff --git a/StringView.cs b/StringView.cs
new file mode 100644
index 0000000..9102e53
--- /dev/null
+++ b/StringView.cs
@@ -0,0 +1,146 @@
+using System;
+using StringProcessingApp.Services;
+
+namespace StringProcessingApp.Views
+{
+    public class StringView
+    {
+        private readonly StringService _service;
+
+        public StringView()
+        {
+            _service = new StringService();
+        }
+
+        public void Start()
+        {
+            bool exitRequested = false;
+
+            do
+            {
+                PrintMenu();
+                Console.Write("Select option: ");
+                string option = Console.ReadLine();
+
+                Console.WriteLine();
+
+                switch (option)
+                {
+                    case "1":
+                        InputText();
+                        break;
+
+                    case "2":
+                        Console.WriteLine("Current Text: " + _service.Display());
+                        break;
+
+                    case "3":
+                        _service.MakeUpper();
+                        Console.WriteLine("Text converted to UPPERCASE.");
+                        break;
+
+                    case "4":
+                        _service.MakeLower();
+                        Console.WriteLine("Text converted to lowercase.");
+                        break;
+
+                    case "5":
+                        Console.WriteLine("Total Characters: " + _service.GetLength());
+                        break;
+
+                    case "6":
+                        CheckWord();
+                        break;
+
+                    case "7":
+                        ReplaceText();
+                        break;
+
+                    case "8":
+                        ExtractText();
+                        break;
+
+                    case "9":
+                        _service.CleanSpaces();
+                        Console.WriteLine("Extra spaces removed.");
+                        break;
+
+                    case "10":
+                        _service.Restore();
+                        Console.WriteLine("Text restored to original.");
+                        break;
+
+                    case "11":
+                        exitRequested = true;
+                        Console.WriteLine("System closing...");
+                        break;
+
+                    default:
+                        Console.WriteLine("Invalid selection.");
+                        break;
+                }
+
+                Console.WriteLine();
+
+            } while (!exitRequested);
+        }
+
+        private void PrintMenu()
+        {
+            Console.WriteLine("==== STRING PROCESSING SYSTEM ====");
+            Console.WriteLine("1. Enter Text");
+            Console.WriteLine("2. View Current Text");
+            Console.WriteLine("3. Convert to UPPERCASE");
+            Console.WriteLine("4. Convert to lowercase");
+            Console.WriteLine("5. Count Characters");
+            Console.WriteLine("6. Check if Contains Word");
+            Console.WriteLine("7. Replace Word");
+            Console.WriteLine("8. Extract Substring");
+            Console.WriteLine("9. Trim Spaces");
+            Console.WriteLine("10. Reset Text");
+            Console.WriteLine("11. Exit");
+            Console.WriteLine("==================================");
+        }
+
+        private void InputText()
+        {
+            Console.Write("Type your text: ");
+            string text = Console.ReadLine();
+            _service.LoadText(text);
+        }
+
+        private void CheckWord()
+        {
+            Console.Write("Word to search: ");
+            string word = Console.ReadLine();
+
+            bool found = _service.HasWord(word);
+
+            Console.WriteLine(found ? "Word exists in text." : "Word not found.");
+        }
+
+        private void ReplaceText()
+        {
+            Console.Write("Word to replace: ");
+            string oldWord = Console.ReadLine();
+
+            Console.Write("New word: ");
+            string newWord = Console.ReadLine();
+
+            _service.ChangeWord(oldWord, newWord);
+            Console.WriteLine("Replacement completed.");
+        }
+
+        private void ExtractText()
+        {
+            Console.Write("Start index: ");
+            int start = int.Parse(Console.ReadLine());
+
+            Console.Write("Length: ");
+            int length = int.Parse(Console.ReadLine());
+
+            _service.GetPart(start, length);
+            Console.WriteLine("Substring extracted.");
+        }
+    }
+}