Merge mandatory and bonus into a single ft_printf, fix edge cases, add README

- Use the flag-aware implementation for both make and make bonus
  (bonus/ moved to src/, _bonus suffix dropped, bonus rule = all)
- Do not treat zero-length output (%s with "", %.0d with 0) as an error
- Return -1 without printing when a % has no conversion ("abc%", "%5")
- Keep field width with '#', '+' and ' '; ignore '0' with '-'
- Fix '#' prefix on zero, '+'/' ' with zero padding, INT_MIN negation UB
- Add README.md required by the subject

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ft_putnbr_base.c

@@ -6,22 +6,65 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/17 12:16:44 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/11/21 14:49:36 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/11/21 15:04:59 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "libft.h"
 
-int	ft_putnbr_base(unsigned long long nbr, char *base, int base_size)
+static int	ft_putnbr_base_extra(unsigned int nbr, char *base, int base_size)
 {
 	int		i;
 	char	temp;
 
 	if (nbr == 0)
 		return (0);
-	i = 1 + ft_putnbr_base(nbr / base_size, base, base_size);
+	i = 1 + ft_putnbr_base_extra(nbr / base_size, base, base_size);
 	temp = base[nbr % base_size];
 	if (write(1, &temp, 1) < 0)
 		return (-10000);
 	return (i);
 }
+
+int	ft_putnbr_base(unsigned int nbr, char *base, int base_size, int limit)
+{
+	char	temp;
+
+	if (nbr == 0 && limit != 0)
+	{
+		temp = base[0];
+		if (write(1, &temp, 1) < 0)
+			return (-10000);
+		return (1);
+	}
+	return (ft_putnbr_base_extra(nbr, base, base_size));
+}
+
+static int	ft_putnbr_base_ll_extra(unsigned long long nbr, char *base,
+		int base_size)
+{
+	int		i;
+	char	temp;
+
+	if (nbr == 0)
+		return (0);
+	i = 1 + ft_putnbr_base_ll_extra(nbr / base_size, base, base_size);
+	temp = base[nbr % base_size];
+	if (write(1, &temp, 1) < 0)
+		return (-10000);
+	return (i);
+}
+
+int	ft_putnbr_base_ll(unsigned long long nbr, char *base, int base_size)
+{
+	char	temp;
+
+	if (nbr == 0)
+	{
+		temp = base[0];
+		if (write(1, &temp, 1) < 0)
+			return (-10000);
+		return (1);
+	}
+	return (ft_putnbr_base_ll_extra(nbr, base, base_size));
+}