diff --git a/ft_strtrim.c b/ft_strtrim.c
new file mode 100644
index 0000000..aeba13a
--- /dev/null
+++ b/ft_strtrim.c
@@ -0,0 +1,55 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strtrim.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: apommier <apommier@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/11/29 23:52:05 by apommier          #+#    #+#             */
+/*   Updated: 2020/12/02 19:29:33 by apommier         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include <libft.h>
+
+static int	is_set(char const *set, char c)
+{
+	int	i;
+
+	i = 0;
+	while (set[i])
+	{
+		if (set[i] == c)
+			return (1);
+	}
+	return (0);
+}
+
+char	*ft_strtrim(char const *s1, char const *set)
+{
+	int		j;
+	int		i;
+	int		len;
+	char	*dest;
+
+	i = 0;
+	j = 0;
+	len = ft_strlen(s1);
+	while (is_set(set, s1[i]))
+		i++;
+	while (is_set(set, s1[len - j - 1]))
+		j++;
+	len = len - i - j;
+	dest = malloc(sizeof(char) * (len + 1));
+	if (dest == 0)
+		return (0);
+	j = 0;
+	while (s[i] && len - j)
+	{
+		dest[j] = s[i];
+		i++;
+		j++;
+	}
+	dest[j] = 0;
+	return (dest);
+}