#include "lib1.h" // Include lib1's own header
#include "lib2.h" // Include lib2's header to call lib2_function
#include "lib3.h" // Include lib3's header to call lib3_function
#include <stdio.h> // Include standard I/O here, as printf is used in this source file.

void lib1_function(unsigned int i)
{
  printf("This is a function from Library 1. %u\n", i);
  lib2_function(); // Call function from lib2
  lib3_function(); // Call function from lib3
  printf("Lib1 has called functions from Lib2 and Lib3.\n");
}