Invert string in Clojure

string-utils.clj

(ns tutorial.string-utils
  (:gen-class))

(defn invert_str
  "Invert a string"
  [value]
  (def end (- (count value) 1))
  (loop [index end result ""]
    (if (not= -1 index)
      (recur (- index 1) (str result (.charAt value index))) (println result))))

(defn -main
    "Invert a string"
    [value]
    (invert_str value))