Почему не виден результат функции?

 #include 
 
#include 
 
#include 
 
using namespace std;
 

 
struct book {
 
    char bookname[70];
 
    char author[50];
 
    char publisher[20];
 
    char genre[20];
 

 
};
 

 

 
book EditBook(book* books);
 
book searchAuth(book* books);
 
void print_one(book exp);
 
void print_all(book* exp);
 

 

 
int main()
 
{
 
    book* BOOK;
 
    book books[10] = { {"Caroline","Neil","Bloomsbury","horror"},
 
        {"Alice","Neil","Bloomsbury","fantasy"},
 
        {"HarryPotter","Rowling","Bloomsbury","fantasy"},
 
        {"MartinEden","Martin Lee","NewDay","sci-fi"},
 
        {"SherlockHolmes","Sd","OldDay","detective"},
 
         {"C++","FF","HTEW","horror"},
 
        {"Python","Rer","Kwed","adventure"},
 
        {"Harry Grotter","Ann","Bloom","fantasy"},
 
        {"Mart","Scier","Toyota","sci-fi"},
 
        {"Sher","Sd","OldDay","psychology"},
 
    };
 
    int choice;
 
    bool isOn = true;
 
    enum opt { exit = 0, edit = 1, showAll = 2, sortAuth = 3, sortTitle = 4 };
 
    while (isOn) {
 
        cout << "\n\t\t" << "WELCOME!\n";
 
        cout << "(0)Exit (1)Edit (2)Show all books (3) Sort by author (4) Sort by title: ";
 
        cin >> choice;
 
        switch (choice)
 
        {
 
        default:
 
            isOn = false;
 
            break;
 
        case edit:
 
            EditBook(books);
 
            break;
 
        case showAll:
 
            print_all(books);
 
            break;
 
        case sortAuth:
 
            searchAuth(books);
 
            break;
 
        case sortTitle:
 

 
            break;
 
        }
 

 
    }
 

 
}
 

 

 
void print_one(book exp)
 
{
 
    cout << "BOOK INFO:\n" << "\tTitle: " << exp.bookname << "\t\t" << "\tAuthor: " << exp.author << "\t\t" << " \tPublisher: " << exp.publisher;
 
    cout << "\t\t" << "\tGenre: " << exp.genre << endl;
 
}
 

 
void print_all(book* exp)
 
{
 
    cout << "Name:" << "\t\t" << "Author:" << "\t\t" << "Publisher:";
 
    cout << "\t" << "Genre:";
 
    cout << "\n\n";
 
    for (int i = 0; i < 10; i++)
 
        print_one(exp[i]);
 
}
 

 
book EditBook(book* BOOK) {
 
    char title[30];
 
    char newtitle[30];
 
    cout << "Enter search book title: \n";
 
    cin >> title;
 
    for (size_t i = 0; i < 10; i++)
 
    {
 
        if (strcmp(BOOK[i].bookname,title)==0) {
 
            cout << "Enter new title: \n";
 
            cin >> newtitle;
 
            *BOOK[i].bookname = *newtitle;
 
            return BOOK[i];
 
        }
 
    }
 
    cout << "No such book title\n";
 
    throw "";
 
}
 

 
book searchAuth(book* BOOK) {
 
    char Author[30];
 
    cout << "Enter search book author: \n";
 
    cin >> Author;
 
    for (size_t i = 0; i < 10; i++)
 
    {
 
        if (strcmp(BOOK[i].author, Author) == 0) {
 
            return BOOK[i];
 
        }
 
    }
 
    cout << "No such book title\n";
 
    throw "";
 
}