text: //#include "screen.h"
  #include "types.h"
  #include "util.h"
  #include "kb.h"
  #include "idt.h"
  
  void launch_shell(int n);
  void sum();
  void fill_array(int arr[], int n);
  void print_array(int arr[], int n);
  int sum_array(int arr[], int n);
  void echo();
  void sort();
  void insertion_sort(int arr[], int n, int order);
  void fibonacci();
  int fibo(int n);
  void set_bg_color();
  void help();