diff --git a/libft/ft_str_is_only_char.c b/libft/ft_str_is_only_char.c
new file mode 100644
index 0000000..3bc8081
--- /dev/null
+++ b/libft/ft_str_is_only_char.c
@@ -0,0 +1,20 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_str_is_only_char.c                              :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: marde-vr <marde-vr@42angouleme.fr>         +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/04/29 11:11:31 by marde-vr          #+#    #+#             */
+/*   Updated: 2024/04/29 11:11:57 by marde-vr         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+int	ft_str_is_only_char(char *str, char c)
+{
+	while (c && *str == c)
+		str++;
+	if (!*str && c)
+		return (1);
+	return (0);
+}