fix to get better heap location

vm-intro/va.c

@@ -2,10 +2,10 @@
 #include <stdlib.h>
 
 int main(int argc, char *argv[]) {
-    printf("location of code  : %p\n", main);
-    printf("location of heap  : %p\n", malloc(1));
+    printf("location of code : %p\n", main);
+    printf("location of heap : %p\n", malloc(100000000));
     int x = 3;
-    printf("location of stack : %p\n", &x);
+    printf("location of stack: %p\n", &x);
     return 0;
 }