string-processing-system [ABUEVA}

Program.cs

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+using StringProcessingApp.Views;
+
+// Program entry point
+StringView view = new StringView();
+view.Run();

StringService.cs

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+namespace StringProcessingApp.Services
+{
+    public class StringService
+    {
+        private string _originalText = "";
+        private string _currentText = "";
+
+        public void SetText(string text)
+        {
+            _originalText = text;
+            _currentText = text;
+        }
+
+        public string GetCurrentText() => _currentText;
+
+        public void ToUpper() => _currentText = _currentText.ToUpper();
+
+        public void ToLower() => _currentText = _currentText.ToLower();
+
+        public int GetLength() => _currentText.Length;
+
+        public bool ContainsWord(string word) => _currentText.Contains(word);
+
+        public void ReplaceWord(string oldWord, string newWord) 
+            => _currentText = _currentText.Replace(oldWord, newWord);
+
+        public void ExtractSubstring(int startIndex, int length)
+        {
+            if (startIndex >= 0 && startIndex + length <= _currentText.Length)
+                _currentText = _currentText.Substring(startIndex, length);
+        }
+
+        public void TrimSpaces() => _currentText = _currentText.Trim();
+
+        public void ResetText() => _currentText = _originalText;
+    }
+}

StringView.cs

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+using StringProcessingApp.Services;
+
+namespace StringProcessingApp.Views
+{
+    public class StringView
+    {
+        private readonly StringService _service = new StringService();
+
+        public void Run()
+        {
+            bool running = true;
+            while (running)
+            {
+                DisplayMenu();
+                string choice = Console.ReadLine() ?? "";
+
+                switch (choice)
+                {
+                    case "1":
+                        Console.Write("Enter new text: ");
+                        _service.SetText(Console.ReadLine() ?? "");
+                        break;
+                    case "2":
+                        Console.WriteLine($"Current Text: [{_service.GetCurrentText()}]");
+                        break;
+                    case "3":
+                        _service.ToUpper();
+                        break;
+                    case "4":
+                        _service.ToLower();
+                        break;
+                    case "5":
+                        Console.WriteLine($"Character Count: {_service.GetLength()}");
+                        break;
+                    case "6":
+                        Console.Write("Word to find: ");
+                        string word = Console.ReadLine() ?? "";
+                        Console.WriteLine(_service.ContainsWord(word) ? "Found!" : "Not found.");
+                        break;
+                    case "7":
+                        Console.Write("Word to replace: ");
+                        string oldW = Console.ReadLine() ?? "";
+                        Console.Write("New word: ");
+                        string newW = Console.ReadLine() ?? "";
+                        _service.ReplaceWord(oldW, newW);
+                        break;
+                    case "8":
+                        Console.Write("Start index: ");
+                        int start = int.Parse(Console.ReadLine() ?? "0");
+                        Console.Write("Length: ");
+                        int len = int.Parse(Console.ReadLine() ?? "0");
+                        _service.ExtractSubstring(start, len);
+                        break;
+                    case "9":
+                        _service.TrimSpaces();
+                        break;
+                    case "10":
+                        _service.ResetText();
+                        Console.WriteLine("Text reset to original.");
+                        break;
+                    case "11":
+                        running = false;
+                        break;
+                    default:
+                        Console.WriteLine("Invalid option.");
+                        break;
+                }
+                Console.WriteLine("\nPress any key to continue...");
+                Console.ReadKey();
+            }
+        }
+
+        private void DisplayMenu()
+        {
+            Console.Clear();
+            Console.WriteLine("--- String Processing System ---");
+            Console.WriteLine("1. Enter Text\n2. View Current Text\n3. Convert to UPPERCASE");
+            Console.WriteLine("4. Convert to lowercase\n5. Count Characters\n6. Check if Contains Word");
+            Console.WriteLine("7. Replace Word\n8. Extract Substring\n9. Trim Spaces");
+            Console.WriteLine("10. Reset Text\n11. Exit");
+            Console.Write("\nSelect an option: ");
+        }
+    }
+}