diff --git a/StringProcessingApp/Program.cs b/StringProcessingApp/Program.cs
new file mode 100644
index 0000000..c418fdf
--- /dev/null
+++ b/StringProcessingApp/Program.cs
@@ -0,0 +1,13 @@
+using StringProcessingApp.Views;
+
+namespace StringProcessingApp
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            StringView view = new StringView();
+            view.Run();
+        }
+    }
+}
diff --git a/StringProcessingApp/Services/StringService.cs b/StringProcessingApp/Services/StringService.cs
new file mode 100644
index 0000000..b382d00
--- /dev/null
+++ b/StringProcessingApp/Services/StringService.cs
@@ -0,0 +1,61 @@
+using System;
+
+namespace StringProcessingApp.Services
+{
+    public class StringService
+    {
+        private string _originalText = "";
+        private string _currentText = "";
+
+        public void SetText(string text)
+        {
+            _originalText = text;
+            _currentText = text;
+        }
+
+        public string GetText()
+        {
+            return _currentText;
+        }
+
+        public void ToUpperCase()
+        {
+            _currentText = _currentText.ToUpper();
+        }
+
+        public void ToLowerCase()
+        {
+            _currentText = _currentText.ToLower();
+        }
+
+        public int CountCharacters()
+        {
+            return _currentText.Length;
+        }
+
+        public bool ContainsWord(string word)
+        {
+            return _currentText.Contains(word);
+        }
+
+        public void ReplaceWord(string oldWord, string newWord)
+        {
+            _currentText = _currentText.Replace(oldWord, newWord);
+        }
+
+        public string ExtractSubstring(int startIndex, int length)
+        {
+            return _currentText.Substring(startIndex, length);
+        }
+
+        public void TrimSpaces()
+        {
+            _currentText = _currentText.Trim();
+        }
+
+        public void Reset()
+        {
+            _currentText = _originalText;
+        }
+    }
+}
diff --git a/StringProcessingApp/Views/StringView.cs b/StringProcessingApp/Views/StringView.cs
new file mode 100644
index 0000000..7c215af
--- /dev/null
+++ b/StringProcessingApp/Views/StringView.cs
@@ -0,0 +1,143 @@
+using System;
+using StringProcessingApp.Services;
+
+namespace StringProcessingApp.Views
+{
+    public class StringView
+    {
+        private readonly StringService _service;
+
+        public StringView()
+        {
+            _service = new StringService();
+        }
+
+        public void Run()
+        {
+            bool running = true;
+
+            while (running)
+            {
+                ShowMenu();
+                Console.Write("Select an option: ");
+                string choice = Console.ReadLine();
+
+                Console.WriteLine();
+
+                switch (choice)
+                {
+                    case "1":
+                        EnterText();
+                        break;
+                    case "2":
+                        ViewCurrentText();
+                        break;
+                    case "3":
+                        _service.ToUpperCase();
+                        Console.WriteLine("Converted to UPPERCASE.");
+                        break;
+                    case "4":
+                        _service.ToLowerCase();
+                        Console.WriteLine("Converted to lowercase.");
+                        break;
+                    case "5":
+                        Console.WriteLine($"Character Count: {_service.CountCharacters()}");
+                        break;
+                    case "6":
+                        CheckContains();
+                        break;
+                    case "7":
+                        ReplaceWord();
+                        break;
+                    case "8":
+                        ExtractSubstring();
+                        break;
+                    case "9":
+                        _service.TrimSpaces();
+                        Console.WriteLine("Spaces trimmed.");
+                        break;
+                    case "10":
+                        _service.Reset();
+                        Console.WriteLine("Text reset to original.");
+                        break;
+                    case "11":
+                        running = false;
+                        Console.WriteLine("Thank you for using the app, bye!");
+                        break;
+                    default:
+                        Console.WriteLine("Invalid choice. Please try again.");
+                        break;
+                }
+
+                Console.WriteLine();
+            }
+        }
+
+        private void ShowMenu()
+        {
+            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 EnterText()
+        {
+            Console.Write("Enter your text: ");
+            string text = Console.ReadLine();
+            _service.SetText(text);
+            Console.WriteLine("Text saved successfully.");
+        }
+
+        private void ViewCurrentText()
+        {
+            Console.WriteLine($"Current Text: {_service.GetText()}");
+        }
+
+        private void CheckContains()
+        {
+            Console.Write("Enter word to check: ");
+            string word = Console.ReadLine();
+
+            bool result = _service.ContainsWord(word);
+
+            if (result)
+                Console.WriteLine("The text contains the word.");
+            else
+                Console.WriteLine("The text does NOT contain the word.");
+        }
+
+        private void ReplaceWord()
+        {
+            Console.Write("Enter word to replace: ");
+            string oldWord = Console.ReadLine();
+
+            Console.Write("Enter new word: ");
+            string newWord = Console.ReadLine();
+
+            _service.ReplaceWord(oldWord, newWord);
+            Console.WriteLine("Word replaced successfully.");
+        }
+
+        private void ExtractSubstring()
+        {
+                Console.Write("Enter start index: ");
+                int start = int.Parse(Console.ReadLine());
+
+                Console.Write("Enter length: ");
+                int length = int.Parse(Console.ReadLine());
+
+                string result = _service.ExtractSubstring(start, length);
+                Console.WriteLine($"Extracted Substring: {result}");
+        }
+    }
+}