It finnaly kinda works

algorithm with no double nodes and nearly efficient enough
still some optimizations to find for --big-superposition maps

libft/srcs/ft_strrchr.c

@@ -0,0 +1,28 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strrchr.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: tmaze <marvin@42.fr>                       +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2018/04/05 10:40:13 by tmaze             #+#    #+#             */
+/*   Updated: 2018/04/05 11:05:31 by tmaze            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_strrchr(const char *s, int c)
+{
+	int		i;
+	char	*tmp;
+	char	*ret;
+
+	i = -1;
+	ret = NULL;
+	tmp = (char*)s;
+	while (++i == 0 || tmp[i - 1])
+		if (tmp[i] == c)
+			ret = &tmp[i];
+	return (ret);
+}