Improved ISBN Formatting for Consistent Input Handling

database/books.csv

@@ -0,0 +1,2 @@
+title,author,isbn,AvailableInLibrary,timestamp
+IKIGAI,Hector Garcia,978-1-786330-89-5,Yes,2025-06-30 20:01:55

database/users.csv

@@ -0,0 +1,2 @@
+Name,UserID,BookInHand,timestamp
+Hema,123,,2025-06-30 18:24:15

main.py

@@ -7,6 +7,16 @@
 from user_management import UserManagement
 from checkout_management import CheckoutManagement
 from libutils.storage import Storage
+import re
+
+def format_isbn(isbn):
+    # Remove non-digit characters
+    digits = re.sub(r'\D', '', isbn)
+    if len(digits) != 13:
+        return None
+    return f"{digits[0:3]}-{digits[3]}-{digits[4:10]}-{digits[10:12]}-{digits[12]}"
+
+
 
 class LibraryManagementSystem:
     def __init__(self):
@@ -31,35 +41,47 @@ def display_main_menu(self) -> str:
         Returns:
             str: The user's choice.
         """
-        print(f"\n-------------------------------\n🏛️ Library Management System 🏛️\n-------------------------------")
+        print("\n-------------------------------\n🏛️ Library Management System 🏛️\n-------------------------------")
         print("1. 🆕 Add Book")
         print("2. 📚 List Books")
         print("3. 🆕 Add User")
         print("4. 📜 List Users")
         print("5. ✅ Checkout Book")
         print("6. ⛔ Exit")
         return input("Enter choice: ")
+
+
+
+
+
 
     def add_book(self, title: str, author: str, isbn: str) -> None:
-            """
-            Adds a book to the library.
-
-            Args:
-                title (str): The title of the book.
-                author (str): The author of the book.
-                isbn (str): The ISBN of the book.
-            """
-            try:
-                self.book_manager.add_book(title, author, isbn)
-            except ValueError as e:
-                if str(e).strip() == "Invalid ISBN":
-                    print(f"\n❌ Error: {e} ❌")
-                    print("Valid ISBN example: 978-0-123456-78-9")
-                elif str(e).strip() == "Book with the same ISBN already exists.":
-                    print(f"\n❌ Error: {e} ❌")
-                    print(self.list_books())
-                else:
-                    print(f"\n❌ Error: {e} ❌")
+        """
+        Adds a book to the library.
+
+        Args:
+            title (str): The title of the book.
+            author (str): The author of the book.
+            isbn (str): The ISBN of the book.
+        """
+        formatted_isbn = format_isbn(isbn)
+        if not formatted_isbn:
+            print("\n❌ Error: Invalid ISBN ❌")
+            print("Valid ISBN example: 978-0-123456-78-9")
+            return
+
+        try:
+            self.book_manager.add_book(title, author, formatted_isbn)
+        except ValueError as e:
+            if str(e).strip() == "Invalid ISBN":
+                print(f"\n❌ Error: {e} ❌")
+                print("Valid ISBN example: 978-0-123456-78-9")
+            elif str(e).strip() == "Book with the same ISBN already exists.":
+                print(f"\n❌ Error: {e} ❌")
+                print(self.list_books())
+            else:
+                print(f"\n❌ Error: {e} ❌")
+
 
     def checkout_book(self) -> None:
         """