added missing header

ebuka1017 · ebuka1017 · commit 183cc0bc1e6b · 2023-06-14T19:43:13.000-07:00
diff --git a/0x0A-argc_argv/3-mul.c b/0x0A-argc_argv/3-mul.c
@@ -1,5 +1,6 @@
 #include "main.h"
 #include <stdio.h>
+#include <stdlib.h>
 
 /**
  * main - start of program
