feat: Support Unary Operation #1

bin/main.ml

@@ -1,7 +1,7 @@
 (* bin/main.ml *)
 
 open Printf
-open Ast
+open Ast.Print
 
 let () =
   let lexbuf = Lexing.from_channel stdin in
@@ -16,4 +16,4 @@ let () =
         exit 1
   in
   let _ = res in
-  Printf.printf "%s\n" (string_of_source_file res)
+  Printf.printf "%s\n" (string_of_source_file res)