diff --git a/.gitmodules b/.gitmodules
index e396f64..1f14a97 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "webgl"]
 	path = webgl
 	url = https://git.gaetanbrochard.dev/gbrochar/webgl
+[submodule "libft"]
+	path = libft
+	url = https://git.gaetanbrochard.dev/gbrochar/libft.git
diff --git a/Makefile b/Makefile
index b067644..8d02c09 100644
--- a/Makefile
+++ b/Makefile
@@ -41,11 +41,11 @@ SRC =		$(addprefix $(SRC_DIR), $(SRC_FILE))
 OBJ =		$(addprefix $(OBJ_DIR), $(OBJ_FILE))
 INC =		$(addprefix $(INC_DIR), $(INC_FILE))
 
-LIB =		-lm -lGL -lglfw glew-2.2.0/lib/libGLEW.a
+LIB =		-lm -lGL -lglfw glew-2.2.0/lib/libGLEW.a libft/libft.a
 
 CC =		gcc
 
-CFLAGS =	-Wall -Werror -Wextra -g3
+CFLAGS =	-Wall -Werror -Wextra
 
 RED = \033[31m
 GREEN = \033[32m
@@ -58,6 +58,7 @@ all: $(NAME)
 
 $(NAME): $(OBJ) $(INC)
 	@make -C glew-2.2.0
+	@make -C libft
 	@$(CC) $(CFLAGS) -c $(SRC) -I $(INC_DIR) -I glew-2.2.0/include/
 	@mv $(OBJ_FILE) $(OBJ_DIR)
 	@$(CC) $(CFLAGS) $(OBJ) -o $(NAME) $(LIB)
@@ -71,11 +72,13 @@ $(OBJ_DIR)%.o: $(SRC_DIR)%.c inc/
 	@echo -e "$(CYAN)[CC]$(WHITE) $<"
 
 clean:
+	@make -C libft clean
 	@rm -rf $(OBJ_DIR)
 	@echo -e "$(RED)[REMOVED]$(WHITE) obj files"
 
 fclean: clean
 	@make -C glew-2.2.0 clean
+	@make -C libft fclean
 	@rm -f $(NAME)
 	@echo -e "$(RED)[REMOVED]$(WHITE) $(NAME)"
 
diff --git a/inc/scop.h b/inc/scop.h
index d5a5e33..40ae934 100644
--- a/inc/scop.h
+++ b/inc/scop.h
@@ -1,6 +1,7 @@
 #ifndef SCOP_H
 # define SCOP_H
 
+# include "../libft/libft.h"
 # include <stdio.h>
 # include <string.h>
 # include <ctype.h>
diff --git a/libft b/libft
new file mode 160000
index 0000000..1ab0cdf
--- /dev/null
+++ b/libft
@@ -0,0 +1 @@
+Subproject commit 1ab0cdf1acf97db0cb8d90940c96a6f1ccb3a7af
diff --git a/src/parse_line.c b/src/parse_line.c
index 8534b46..c450c9a 100644
--- a/src/parse_line.c
+++ b/src/parse_line.c
@@ -107,7 +107,7 @@ void				parse_triangulate_dispatcher(t_env *e, int vertex_count) {
 }
 
 void strtrim(char *line) {
-	size_t i = strlen(line) - 1;
+	size_t i = ft_strlen(line) - 1;
 	while (isspace(line[i])) {
 		line[i] = '\0';
 		i--;
diff --git a/src/parse_token.c b/src/parse_token.c
index cb3b77a..62d0b53 100644
--- a/src/parse_token.c
+++ b/src/parse_token.c
@@ -44,15 +44,15 @@ int					parse_append_data_index(t_env *e, char *phrase) {
 	int ret;
 
 	while ((token = strtok_r(phrase, "/", &phrase))) {
-		if (strlen(token) > 0 && token_count == 0) {
+		if (ft_strlen(token) > 0 && token_count == 0) {
 			e->object.properties |= VERTEX_FLAG;
 			ret = parse_append_data_ui(&(e->object.vertices_indices), token);
 		}
-		else if (strlen(token) > 0 && token_count == 1) {
+		else if (ft_strlen(token) > 0 && token_count == 1) {
 			e->object.properties |= UV_FLAG;
 			ret = parse_append_data_ui(&(e->object.uvs_indices), token);
 		}
-		else if (strlen(token) > 0 && token_count == 2) {
+		else if (ft_strlen(token) > 0 && token_count == 2) {
 			e->object.properties |= NORMAL_FLAG;
 			ret = parse_append_data_ui(&(e->object.normals_indices), token);
 		}
diff --git a/src/run.c b/src/run.c
index ddd3e21..cbf9b43 100644
--- a/src/run.c
+++ b/src/run.c
@@ -167,7 +167,7 @@ static void AddShader(GLuint ShaderProgram, const char* pShaderText, GLenum Shad
 	const GLchar* p[1];
 	p[0] = pShaderText;
 	GLint Lengths[1];
-	Lengths[0] = strlen(pShaderText);
+	Lengths[0] = ft_strlen(pShaderText);
 	glShaderSource(*shader, 1, p, Lengths);
 	glCompileShader(*shader);
 	GLint success;