Update contents/huffman_encoding/code/ocaml/huffman.ml

Co-authored-by: Dimitri Belopopsky <ShadowMitia@users.noreply.github.com>

Author: shubhamkumar13

contents/huffman_encoding/code/ocaml/huffman.ml

@@ -85,7 +85,7 @@ let huffman huffman_tree = prefixes_of_tree "" huffman_tree
 let char_to_str = Printf.sprintf "%c"
 
 let str_list msg = 
-  List.map char_to_str @@ str_to_charlist msg
+  List.map char_to_str (str_to_charlist msg)
 
 let list_to_string lst =
   String.concat "" lst