- re-added ft_putchar/putnbr/putstr without fd

- added const for pointers in these functions

srcs/ft_putstr_fd.c

@@ -16,7 +16,7 @@
 
 #include "libft.h"
 
-void	ft_putstr_fd(char *s, int fd)
+void	ft_putstr_fd(const char *s, int fd)
 {
 	while (s && *s)
 		ft_putchar_fd(*s++, fd);