```common lisp
(defpackage #:hello-world
  (:use #:cl)
  (:export #:hello))
(in-package #:hello-world)

(defun hello ())
```

Add in stub string for the exercise.
user
```common lisp
(defpackage #:hello-world
  (:use #:cl)
  (:export #:hello))
(in-package #:hello-world)

(defun hello () "Put your greeting here.")
```
assistant