string findBook(vector<Books> listBooks, string title,string author){
    Books specificBookSearched;
    string test;
    int i;
    
    for(i = 0; i < listBooks.size(); i++){
        if(listBooks[i].getAuthor().find(author) != string::npos){
            specificBookSearched = listBooks[i];
            test = specificBookSearched.getTitle() + "  " + specificBookSearched.getAuthor() + "  " + specificBookSearched.getPublisher();
            break;
        }
        else{
            test = "book not found";
        }
    }
    
    
    
    return test;
    
}