Welcome to the library management system, please type your commands.
> book1 This testcase is to test the robustness of your name added to the system.
> C++ Primer added to the system.
>  Jigang added to the system.
>  Aloha added to the system.
> Success! C++ Primer is borrowed by  Jigang.
> Fail! The book was borrowed by another customer.
> Success! The following book has been returned:
2 C++ Primer
> Success! C++ Primer is borrowed by  Aloha.
> Fail! The book has not been borrowed.
> Exit the system!

Welcome to the library management system, please type your commands.
> book1 This testcase is to test the robustness of your name added to the system.
> C++ Primer added to the system.
> Jigang added to the system.
> Aloha added to the system.
> Success! C++ Primer is borrowed by Jigang.
> Fail! The book was borrowed by another customer.
> Success! The following book has been returned:
2 C++ Primer
> Success! C++ Primer is borrowed by Aloha.
> Fail! The book has not been borrowed.
> Exit the system!