Multiple C files

compile.sh

gcc main.c utils.c -o runMe

main.c

#include <stdio.h>
#include "utils.h"

int main() {
    printf(helloWorld());
    return 0;
}

utils.c

//
// Created by bigbeno37 on 21/07/17.
//

char *helloWorld() {
    return "Hello world!\n";
}

utils.h

//
// Created by bigbeno37 on 21/07/17.
//

#ifndef MYFIRSTPROJECT_UTILS_H
#define MYFIRSTPROJECT_UTILS_H

char *helloWorld();

#endif //MYFIRSTPROJECT_UTILS_H