Add Ex0 to Ex3 (Ex4 and Ex5 is empty actually)

ex0/ft_strdup.c

@@ -0,0 +1,72 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strdup.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lclerel- <lclerel-@learner.42.tech>        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/03/16 14:01:43 by lclerel-          #+#    #+#             */
+/*   Updated: 2026/03/16 16:31:19 by lclerel-         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <unistd.h>
+#include <stdlib.h>
+
+char	*ft_strdup(char *src)
+{
+	int		i;
+	int		len;
+	char	*dst;
+
+	i = 0;
+	len = 0;
+	while (src[len])
+	{
+		len++;
+	}
+	dst = malloc(sizeof(char) * (len + 1));
+	if (dst == NULL)
+	{
+		return (NULL);
+	}
+	while (i < len)
+	{
+		dst[i] = src[i];
+		i++;
+	}
+	dst[i] = '\0';
+	return (dst);
+}
+/*
+
+void    ft_putchar(char chara)
+{
+        write(1, &chara, 1);
+}
+
+void    ft_putstr(char *str)
+{
+        int     i;
+
+        i = 0;
+        while (str[i])
+        {
+                ft_putchar(str[i]);
+                i++;
+        }
+}
+
+int	main(void)
+{
+	char	*dest;
+
+	dest = ft_strdup("TestTest");
+	
+	if (dest == NULL)
+	{
+		return (1);
+	}
+	ft_putstr(dest);
+	free(dest);
+}*/