diff --git a/c-basic/foo.c b/c-basic/foo.c
new file mode 100644
index 0000000..af54fe7
--- /dev/null
+++ b/c-basic/foo.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int foo() {
+    printf("I am foo\n");
+
+    return 0; 
+}
diff --git a/c-basic/foo.h b/c-basic/foo.h
new file mode 100644
index 0000000..4ec598a
--- /dev/null
+++ b/c-basic/foo.h
@@ -0,0 +1,6 @@
+#ifndef FOO_H
+#define FOO_H
+
+int foo();
+
+#endif
diff --git a/c-basic/main.c b/c-basic/main.c
index 2f1ce6c..450c2ea 100644
--- a/c-basic/main.c
+++ b/c-basic/main.c
@@ -1,8 +1,8 @@
 #include <stdio.h>
+#include "foo.h"
 
 int main() {
-
-  printf("hello world year 2025 !\n");
-
-  return 0;
+    foo();
+    
+    return 0;
 }