[enh] free memory for 'pwd' call.

libft.h

@@ -63,7 +63,7 @@ void				*ft_memalloc(size_t size);
 void				ft_memdel(void **ap);
 char				*ft_strnew(size_t size);
 void				ft_strdel(char **as);
-char				*ft_assign_free_str(char *str, char *(*f)(const char*));
+char				*ft_assign_free_str(char *str, void *(*f)(const char*));
 void				ft_strclr(char *s);
 void				ft_striter(char *s, void (*f)(char *));
 void				ft_striteri(char *s, void (*f)(unsigned int, char *));

src/ft_assign_free_str.c

@@ -18,7 +18,7 @@
 ** return new value
 */
 
-char	*ft_assign_free_str(char *str, char *(*f)(const char*))
+char	*ft_assign_free_str(char *str, void *(*f)(const char*))
 {
 	char	*tmp;