diff --git a/Makefile b/Makefile
index e3f3af6..dbfa767 100755
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,8 @@ SRCS =	is/ft_isalpha.c is/ft_isdigit.c is/ft_isascii.c is/ft_isprint.c \
 SRCS +=	str/ft_len.c str/ft_lcpy.c str/ft_lcat.c str/ft_chr.c \
 		str/ft_rchr.c str/ft_ncmp.c str/ft_nstr.c str/ft_dup.c \
 		str/ft_sub.c str/ft_join.c str/ft_trim.c str/ft_split.c  \
-		str/ft_rev.c str/ft_mapi.c str/ft_iteri.c str/ft_join_with.c
+		str/ft_rev.c str/ft_mapi.c str/ft_iteri.c str/ft_join_with.c \
+		str/ft_new.c str/ft_append.c 
 
 SRCS +=	conv/ft_toupper.c conv/ft_tolower.c conv/ft_atoi.c conv/ft_itoa.c \
 		conv/ft_itox.c conv/ft_utoa.c
diff --git a/libft.h b/libft.h
index de7b0c1..20b31d4 100755
--- a/libft.h
+++ b/libft.h
@@ -10,8 +10,7 @@
 /*                                                                            */
 /* ************************************************************************** */
 
-#ifndef LIBFT_H
-# define LIBFT_H
+#pragma once
 
 # include <stddef.h>
 # include <stdlib.h>
@@ -87,12 +86,14 @@ void	ft_putchar_fd(char c, int fd);
 void	ft_putstr_fd(char *s, int fd);
 void	ft_putendl_fd(char *s, int fd);
 void	ft_putnbr_fd(int n, int fd);
+char	*ft_append(char *s1, char *s2);
+char	*ft_strnew(int n, char c);
 
 t_slist	*ft_slst_new(void *content);
-void	ft_slst_add_front(t_slist **alst, t_slist *new);
+void	ft_slst_add_front(t_slist **alst, t_slist *new_e);
 int		ft_slst_size(t_slist *lst);
 t_slist	*ft_slst_last(t_slist *lst);
-void	ft_slst_add_back(t_slist **alst, t_slist *new);
+void	ft_slst_add_back(t_slist **alst, t_slist *new_e);
 void	ft_slst_delone(t_slist *lst, void (*del)(void *));
 void	ft_slst_clear(t_slist **lst, void (*del)(void *));
 void	ft_slst_iter(t_slist *lst, void (*f)(void *));
@@ -105,4 +106,3 @@ int		ft_ilst_is_in(int value, t_i_slist lst);
 t_dlist	*ft_dlst_add(t_dlist *prev, void *content);
 t_dlist	*ft_dlst_n(t_dlist *lst, size_t n);
 char	**ft_dlst_to_arr(t_dlist	*ptr);
-#endif
diff --git a/slist/ft_add_back.c b/slist/ft_add_back.c
index 5311366..6d53548 100755
--- a/slist/ft_add_back.c
+++ b/slist/ft_add_back.c
@@ -12,17 +12,17 @@
 
 #include "../libft.h"
 
-void	ft_slst_add_back(t_slist **alst, t_slist *new)
+void	ft_slst_add_back(t_slist **alst, t_slist *new_e)
 {
 	t_slist	*i_cell;
 
-	if (!alst || !new)
+	if (!alst || !new_e)
 		return ;
 	if (*alst)
 	{
 		i_cell = ft_slst_last(*alst);
-		i_cell->next = new;
+		i_cell->next = new_e;
 	}
 	else
-		*alst = new;
+		*alst = new_e;
 }
diff --git a/slist/ft_add_front.c b/slist/ft_add_front.c
index 32fcb60..26229c2 100755
--- a/slist/ft_add_front.c
+++ b/slist/ft_add_front.c
@@ -12,11 +12,11 @@
 
 #include "../libft.h"
 
-void	ft_slst_add_front(t_slist **alst, t_slist *new)
+void	ft_slst_add_front(t_slist **alst, t_slist *new_e)
 {
-	if (!alst || !new)
+	if (!alst || !new_e)
 		return ;
 	if (*alst)
-		new->next = *alst;
-	*alst = new;
+		new_e->next = *alst;
+	*alst = new_e;
 }
diff --git a/str/ft_append.c b/str/ft_append.c
new file mode 100644
index 0000000..ff3362a
--- /dev/null
+++ b/str/ft_append.c
@@ -0,0 +1,16 @@
+#include "../libft.h"
+
+char	*ft_append(char *s1, char *s2)
+{
+	char	*ret;
+
+	ret = NULL;
+	if (!s1)
+		return (s2);
+	if (!s2)
+		return (s1);
+	ret = ft_strjoin(s1, s2);
+	free(s1);
+	free(s2);
+	return (ret);
+}
diff --git a/str/ft_new.c b/str/ft_new.c
new file mode 100644
index 0000000..06d3f9e
--- /dev/null
+++ b/str/ft_new.c
@@ -0,0 +1,18 @@
+#include "../libft.h"
+
+char	*ft_strnew(int n, char c)
+{
+	char	*str;
+
+	str = NULL;
+	if (n < 0)
+		return (NULL);
+	str = malloc(n + 1);
+	if (!str)
+		return (NULL);
+	str[n] = '\0';
+	while (--n >= 0)
+		str[n] = c;
+	return (str);
+}
+