int prompt_value(const char* msg, int* result);
int* prompt_array(int array[], unsigned* size);
-void display_array(int* array, int size);
+void display_choice_menu();
+
+int* do_concat(int array[], unsigned* size);
+void do_sort(int array[], unsigned size);
+void do_count(int array[], unsigned size);
+
+void display_array(int array[], unsigned size);
#endif /* IO_H */