diff --git a/include/chardefs.h b/include/chardefs.h
index f56477c..b10f55f 100644
--- a/include/chardefs.h
+++ b/include/chardefs.h
@@ -6,15 +6,20 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/23 13:23:25 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/23 13:24:41 by sede-san         ###   ########.fr       */
+/*   Updated: 2025/10/29 17:13:45 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #ifndef CHARDEFS_H
 # define CHARDEFS_H
 
+# define DOT '.'
+# define SLASH '/'
+# define BACKSLASH '\''
 # define DOLLAR '$'
 # define SINGLE_QUOTE '\''
 # define DOUBLE_QUOTE '\"'
+# define COLON ':'
+# define SEMICOLON ';'
 
 #endif /* CHARDEFS_H */
diff --git a/include/core.h b/include/core.h
index 8a3608b..b8234f9 100644
--- a/include/core.h
+++ b/include/core.h
@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/22 19:10:13 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/23 23:19:58 by sede-san         ###   ########.fr       */
+/*   Updated: 2025/10/30 12:46:15 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -21,6 +21,7 @@
 
 typedef struct s_minishell	t_minishell;
 typedef struct s_variables	t_variables;
+typedef struct s_command	t_command;
 
 /**
  * @brief Structure that holds both environment and internal variables
@@ -51,6 +52,23 @@ typedef struct s_minishell
 	u_int8_t	exit_status;
 }	t_minishell;
 
+/**
+ * @brief Structure representing a single command in the shell
+ *
+ * This structure holds all the necessary information for executing a command
+ * in the minishell, including its arguments and executable path.
+ *
+ * @param argc Number of arguments in the command (including the command name)
+ * @param argv Array of strings containing the command and its arguments
+ * @param path Full path to the executable file for this command
+ */
+typedef struct s_command
+{
+	int		argc;
+	char	**argv;
+	char	*path;
+}	t_command;
+
 /******************************************************************************/
 /*                                 Functions                                  */
 /******************************************************************************/
diff --git a/include/minishell.h b/include/minishell.h
index 87cbbcb..20140b8 100644
--- a/include/minishell.h
+++ b/include/minishell.h
@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/20 16:35:10 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/23 13:25:25 by sede-san         ###   ########.fr       */
+/*   Updated: 2025/10/30 12:20:08 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -14,9 +14,12 @@
 # define MINISHELL_H
 
 # include "libft.h"
+# include "ft_printf.h"
+# include "chardefs.h"
 # include "core.h"
 # include "parser.h"
-# include "chardefs.h"
+# include "executor.h"
+# include "builtins.h"
 # include <readline/readline.h>	// readline(3), rl_clear_history(),
 								// rl_on_new_line(), rl_replace_line(),
 								// rl_redisplay()
diff --git a/include/parser.h b/include/parser.h
index 61fd6c7..e2b8972 100644
--- a/include/parser.h
+++ b/include/parser.h
@@ -6,7 +6,7 @@
 /*   By: sede-san <sede-san@student.42madrid.com    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/10/22 19:03:51 by sede-san          #+#    #+#             */
-/*   Updated: 2025/10/23 13:31:09 by sede-san         ###   ########.fr       */
+/*   Updated: 2025/10/30 12:44:51 by sede-san         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -15,24 +15,12 @@
 
 # include "minishell.h"
 
-/******************************************************************************/
-/*                           Structures & Data Types                          */
-/******************************************************************************/
-
-typedef struct s_command	t_command;
-
-typedef struct s_command
-{
-	int		argc;
-	char	**argv;
-}	t_command;
-
 /******************************************************************************/
 /*                                 Functions                                  */
 /******************************************************************************/
 
 // parser.c
 
-extern char	*parse(char *line, t_minishell *minishell);
+extern t_command	parse(char *line, t_minishell *minishell);
 
 #endif /* PARSER_H */