diff --git a/.vimrc b/.vimrc
new file mode 100644
index 0000000..224267f
--- /dev/null
+++ b/.vimrc
@@ -0,0 +1,3 @@
+let g:ale_c_clang_options="-Icommon -Icontrib/Unity/src/ -Wall -Wextra -Werror"
+let g:ale_c_cc_options="-Icommon -Icontrib/Unity/src/ -Wall -Wextra -Werror"
+
diff --git a/c03/ex05.c b/c03/ex05.c
new file mode 100644
index 0000000..b4d3e3b
--- /dev/null
+++ b/c03/ex05.c
@@ -0,0 +1,73 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ex05.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: achubuko <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2023/11/30 23:28:26 by achubuko          #+#    #+#             */
+/*   Updated: 2023/11/30 23:58:06 by achubuko         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+#include <unity.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+unsigned int	ft_strlcat(char *dest, char *src, unsigned int size);
+
+char	g_dest[100] = "Hello ";
+char	g_dest_1[100];
+char	g_dest_2[100];
+char	*g_src = "world\0\0\0\0\0\0\0\0";
+size_t	g_r1;
+size_t	g_r2;
+
+void	setUp(void)
+{
+	memcpy(g_dest_1, g_dest, 100);
+	memcpy(g_dest_2, g_dest, 100);
+}
+
+void	tearDown(void)
+{
+}
+
+void	test_strlcat_short_retval(void)
+{
+	g_r1 = strlcat(g_dest_1, g_src, 3);
+	g_r2 = ft_strlcat(g_dest_2, g_src, 3);
+	TEST_ASSERT_EQUAL_INT(g_r1, g_r1);
+}
+
+void	test_strlcat_short(void)
+{
+	g_r1 = strlcat(g_dest_1, g_src, 3);
+	g_r2 = ft_strlcat(g_dest_2, g_src, 3);
+	TEST_ASSERT_EQUAL_STRING(g_dest_1, g_dest_2);
+	TEST_ASSERT_EQUAL_INT(g_r1, g_r1);
+}
+
+void	test_strlcat_normal_retval(void)
+{
+	g_r1 = strlcat(g_dest_1, g_src, 20);
+	g_r2 = ft_strlcat(g_dest_2, g_src, 20);
+	TEST_ASSERT_EQUAL_INT(g_r1, g_r1);
+}
+
+void	test_strlcat_normal(void)
+{
+	g_r1 = strlcat(g_dest_1, g_src, 20);
+	g_r2 = ft_strlcat(g_dest_2, g_src, 20);
+	TEST_ASSERT_EQUAL_STRING(g_dest_1, g_dest_2);
+}
+
+int	main(void)
+{
+	UNITY_BEGIN();
+	RUN_TEST(test_strlcat_normal);
+	RUN_TEST(test_strlcat_normal_retval);
+	RUN_TEST(test_strlcat_short);
+	RUN_TEST(test_strlcat_short_retval);
+	return (UNITY_END());
+}