Builtins fixed

The builtins wasnt protected, now all data received is protected, the hashmap addition is protected and added functionality of env, export and unset (not implemented in this version). Added fixed details documentation in docs/builtins_fixes.md generated by codex and created tests/builtins_edge_cases.sh to test all the builtins to work correctly

src/builtins/env/env.c

@@ -0,0 +1,58 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   env.c                                              :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/02/09 22:05:00 by codex             #+#    #+#             */
+/*   Updated: 2026/02/09 22:05:00 by codex            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "builtins.h"
+
+static void	print_entry(t_map_entry *entry);
+static void	print_env(t_minishell *msh);
+
+uint8_t	builtin_env(
+	t_command cmd,
+	t_minishell *msh
+)
+{
+	if (cmd.argc > 1)
+	{
+		ft_eputendl("minishell: env: too many arguments");
+		return (EXIT_FAILURE);
+	}
+	print_env(msh);
+	return (EXIT_SUCCESS);
+}
+
+static void	print_entry(
+	t_map_entry *entry
+)
+{
+	ft_putstr(entry->key);
+	ft_putchar('=');
+	if (entry->value != NULL)
+		ft_putstr(entry->value);
+	ft_putchar('\n');
+}
+
+static void	print_env(
+	t_minishell *msh
+)
+{
+	t_list	*entries;
+	t_list	*current;
+
+	entries = ft_hashmap_entries(msh->variables.environment);
+	current = entries;
+	while (current != NULL)
+	{
+		print_entry((t_map_entry *)current->content);
+		current = current->next;
+	}
+	ft_lstclear_nodes(&entries);
+}