feat(test/char): adding the unitary test for ft_isprint

- isprint have now the unitary test

test/char/test_isprint.c

@@ -0,0 +1,36 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   test_isprint.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: rparodi <rparodi@student.42.fr>            +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/09/04 16:54:42 by rparodi           #+#    #+#             */
+/*   Updated: 2025/09/05 10:43:55 by rparodi          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "char.h"
+#include "color.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int	main(void)
+{
+	unsigned char	c;
+
+	c = 0;
+	while (c <= 128)
+	{
+		if (ft_isprint(c) != isprint(c))
+		{
+			printf("%s✘ Found %i, excepted %i%s\n", CLR_RED, ft_isprint(c),
+				isprint(c), RESET);
+			exit(1);
+		}
+		else
+			printf("%s✔%s ", CLR_GREEN, RESET);
+		c++;
+	}
+}