hellomake.h

#include<stdio.h>
{
void myPrintHelloMake(void);//it function prototype
}


hellohackers.c

#include<stdio.h>
int main()
 {
 // call a function in another file
 myPrintHelloHackers(); //function call
 return(0);
}


hellofunc.c

#include<stdio.h>
void myPrintHelloMake(void) //function definition
{

 printf("Hello Welcome To HACKFEST!\n");

 return;
}