Update cat.fr.md

subjects/cat.fr.md

@@ -18,17 +18,22 @@
 
 `"Alan Mathison Turing was an English mathematician, computer scientist, logician, cryptanalyst. Turing was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer. Turing is widely considered to be the father of theoretical computer science and artificial intelligence."`
 
--   L eprogramme doit être rendu dans un dossier nommé `cat`.
+-   En cas d'erreur le programme doit afficher l'erreur.
+
+-   Le programme doit être rendu dans un dossier nommé `cat`.
 
 ### Utilisation:
 
 ```console
 student@ubuntu:~/piscine-go/cat$ go build
-student@ubuntu:~/piscine-go/cat$ ./cat Hello There
-Hello
-There
+student@ubuntu:~/piscine-go/cat$ ./cat abc
+open abc: no such file or directory
 student@ubuntu:~/piscine-go/cat$ ./cat quest8.txt
 "Programming is a skill best acquired by pratice and example rather than from books" by Alan Turing
+student@ubuntu:~/piscine-go/cat$ ./cat
+Hello
+Hello
+^C
 student@ubuntu:~/piscine-go/cat$ ./cat quest8.txt quest8T.txt
 "Programming is a skill best acquired by pratice and example rather than from books" by Alan Turing