Reversing a list without using the reverse function

reverse-without-reverse.clj

;;;puttin letfn to work
;;;reverse without the 'reverse' function

(fn[lst]
    (letfn [(my-fun [lst so-far]
              (if (empty? lst)
                 so-far
                 (recur (butlast lst)
                        (conj so-far (last lst)))))]
       (println (my-fun lst []))))