I am foo example

c-basic/foo.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include "foo.h"
+
+int foo() {
+    printf("I am foo\n");
+    return 0;
+}

c-basic/foo.h

@@ -0,0 +1,6 @@
+#ifndef FOO_H
+#define FOO_H
+
+int foo();
+
+#endif

c-basic/main.c

@@ -1,8 +1,8 @@
-#include <stdio.h>
+#include "foo.h"
 
 int main() {
 
-  printf("starting....\n");
+  foo();
 
   return 0;