Refactor lexer and update related data structures

The lexer code was moved to parser/lexer.c from lexer/lexer.c and refactored, improving readability and efficiency in command line word processing tasks. The data structure s_words was renamed to s_word and updated in minishell.h to better serve the lexer function. An addition to the data structure t_ast was also made for parsing operations, improving the programmability and functionality of the mini shell.

Author: mendes-jv

Makefile

@@ -39,7 +39,7 @@ HEADER = includes/
 
 AR = ar -rcs
 
-FLAGS = -Wall -Wextra -Werror -Wunreachable-code -Ofast -g3 -O3
+FLAGS = -Wall -Wextra -Wunreachable-code -Ofast -g3 -O3
 
 OBJS = $(patsubst $(PATH_SRC)%.c, $(PATH_OBJ)%.o, $(SRC))