Print the heap address in chello

Author: thejpster

samples/chello/chello.c

@@ -15,11 +15,11 @@ const NeotronApi *g_api;
 int app_entry(const NeotronApi *f, size_t argc, const FfiString* argv) {
   g_api = f;
   // allocate a buffer
-  void *buffer = calloc(1024, 1);
+  char *buffer = (char*) calloc(1024, 1);
   // write a string into it
-  snprintf(buffer, 1023, "Hello, world!\n");
+  snprintf(buffer, 1023, "Hello, world!");
   // print the buffer
-  printf(buffer);
+  printf("Buffer %p contains: '%s'\n", buffer, buffer);
   // free the buffer
   free(buffer);
   for(size_t i = 0; i < argc; i++) {