private void borrowBook(String bookTitle) {
		for (Book currBook : list) {
			if (currBook.getTitle().equals(bookTitle)) {
				if (currBook.isBorrowed())
					System.out.println("Sorry, this book is already borrowed.");
				else {
					currBook.rented();
					System.out.println("You successfully borrowed "
							+ currBook.getTitle());
				}
				return;
			}
		}
		System.out.println("Sorry, this book is not in our catalog.");
	}