docs: correct example to add new line

subjects/union/README.md

@@ -13,13 +13,14 @@ If the number of arguments is different from 2, then the program displays a newl
 ```console
 $ go run . zpadinton paqefwtdjetyiytjneytjoeyjnejeyj | cat -e
 zpadintoqefwjy$
+$
 $ go run . ddf6vewg64f gtwthgdwthdwfteewhrtag6h4ffdhsd | cat -e
 df6vewg4thras$
+$
 $ go run . rien "cette phrase ne cache rien" | cat -e
 rienct phas$
 $ go run . | cat -e
 $
 $ go run . rien | cat -e
 $
-$
 ```