void close_database();
int add_item2database(list_item item);
void free_list_item(list_item item);
-void remove_items();
+void remove_selected_items();
void sort_surname();
void sort_database();
-void clear_database();
-void find(int next);
-void print_number_of_items();
-void read_database();
char *get_surname(char *s);
-void print_database();
+int find_item(char *str, int start);
+int is_selected(int item);
+
#define LAST_ITEM (items - 1)