replaced occurrences of last exit_status

+ deleted envp comments
+ WIP Macro exit status
+ TODO : Invalid free of environ in readline

srcs/builtins/cd.c

@@ -1,9 +1,6 @@
 
 #include "minishell.h"
 
-// a integrer dans header
-char	*init_prompt(char *prompt_base);
-
 int	builtin_cd(int argc, char *argv[], t_all *c)
 {
 	(void)argc;