Complete missing functions and add header

30 files changed, 143 insertions, 77 deletions

diff --git a/Makefile b/Makefile
index 3920b81..8759efa 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,41 @@ NAME=libft.a
 CC=cc
 CFLAGS=-Wall -Wextra -Werror
 
-SRC_FILES = $(wildcard *.c)
+SRC_FILES = ft_atoi.c \
+			ft_bzero.c \
+			ft_calloc.c \
+			ft_isalnum.c \
+			ft_isalpha.c \
+			ft_isascii.c \
+			ft_isdigit.c \
+			ft_isprint.c \
+			ft_itoa.c \
+			ft_memchr.c \
+			ft_memcmp.c \
+			ft_memcpy.c \
+			ft_memmove.c \
+			ft_memset.c \
+			ft_putchar_fd.c \
+			ft_putendl_fd.c \
+			ft_putnbr_fd.c \
+			ft_putstr_fd.c \
+			ft_split.c \
+			ft_strchr.c \
+			ft_strdup.c \
+			ft_striteri.c \
+			ft_strjoin.c \
+			ft_strlcat.c \
+			ft_strlcpy.c \
+			ft_strlen.c \
+			ft_strmapi.c \
+			ft_strncmp.c \
+			ft_strnstr.c \
+			ft_strrchr.c \
+			ft_strtrim.c \
+			ft_substr.c \
+			ft_tolower.c \
+			ft_toupper.c \
+
 OBJ_FILES = $(SRC_FILES:.c=.o)
 
 
diff --git a/ft_atoi.c b/ft_atoi.c
index 568a616..90200fb 100644
--- a/ft_atoi.c
+++ b/ft_atoi.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 16:25:27 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 14:04:02 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:17:19 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_atoi(const char *str)
 {
 	int	result;
diff --git a/ft_bzero.c b/ft_bzero.c
index 2f77d78..78af51a 100644
--- a/ft_bzero.c
+++ b/ft_bzero.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/05 10:57:36 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 12:48:25 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:14:10 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 void	ft_bzero(void *s, size_t n)
 {
diff --git a/ft_calloc.c b/ft_calloc.c
index 5baf8f1..2b711d9 100644
--- a/ft_calloc.c
+++ b/ft_calloc.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 19:45:56 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 16:34:30 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:17:31 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <stdlib.h>
+#include "libft.h"
 
 void	*ft_calloc(size_t count, size_t size)
 {
diff --git a/ft_isalnum.c b/ft_isalnum.c
index 4de4a63..d705500 100644
--- a/ft_isalnum.c
+++ b/ft_isalnum.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/04 21:14:49 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/04 21:17:16 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:10:50 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_isalnum(int c)
 {
 	if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0'
diff --git a/ft_isalpha.c b/ft_isalpha.c
index 64d4b9a..054d96c 100644
--- a/ft_isalpha.c
+++ b/ft_isalpha.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/04 19:59:23 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 13:10:30 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:10:10 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_isalpha(int c)
 {
 	if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
diff --git a/ft_isdigit.c b/ft_isdigit.c
index 273bfa3..2601fee 100644
--- a/ft_isdigit.c
+++ b/ft_isdigit.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/04 21:07:03 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/04 21:18:00 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:10:23 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_isdigit(int c)
 {
 	if (c >= '0' && c <= '9')
diff --git a/ft_isprint.c b/ft_isprint.c
index 6c9faed..c04cf4f 100644
--- a/ft_isprint.c
+++ b/ft_isprint.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/04 21:25:31 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/04 21:27:57 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:11:14 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_isprint(int c)
 {
 	if (c >= ' ' && c <= '~')
diff --git a/ft_memchr.c b/ft_memchr.c
index da3b0a6..568faa6 100644
--- a/ft_memchr.c
+++ b/ft_memchr.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 15:23:01 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/06 15:50:06 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:16:25 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 void	*ft_memchr(const void *s, int c, size_t n)
 {
diff --git a/ft_memcmp.c b/ft_memcmp.c
index a1e18da..0bd52df 100644
--- a/ft_memcmp.c
+++ b/ft_memcmp.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 15:54:13 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/06 19:45:09 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:13:54 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 int	ft_memcmp(const void *s1, const void *s2, size_t n)
 {
diff --git a/ft_memcpy.c b/ft_memcpy.c
index 0ca79fa..768d500 100644
--- a/ft_memcpy.c
+++ b/ft_memcpy.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/05 11:15:12 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 13:48:53 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:14:24 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 void	*ft_memcpy(void *dst, const void *src, size_t n)
 {
diff --git a/ft_memmove.c b/ft_memmove.c
index e4aa03e..5d12f20 100644
--- a/ft_memmove.c
+++ b/ft_memmove.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/05 11:41:44 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 13:50:41 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:14:38 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 void	*ft_memmove(void *dst, const void *src, size_t len)
 {
diff --git a/ft_memset.c b/ft_memset.c
index 60a18e9..58c5e1e 100644
--- a/ft_memset.c
+++ b/ft_memset.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/05 09:58:19 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 11:42:44 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:13:09 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 void	*ft_memset(void *b, int c, size_t len)
 {
diff --git a/ft_putchar_fd.c b/ft_putchar_fd.c
index 5a1808d..5334e0e 100644
--- a/ft_putchar_fd.c
+++ b/ft_putchar_fd.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 20:36:14 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/06 21:18:50 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:19:59 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <unistd.h>
+#include "libft.h"
 
 void	ft_putchar_fd(char c, int fd)
 {
diff --git a/ft_putendl_fd.c b/ft_putendl_fd.c
index 9929875..ab08ec4 100644
--- a/ft_putendl_fd.c
+++ b/ft_putendl_fd.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 20:47:17 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/06 20:49:12 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:20:39 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <unistd.h>
+#include "libft.h"
 
 void	ft_putendl_fd(char *s, int fd)
 {
diff --git a/ft_putstr_fd.c b/ft_putstr_fd.c
index 3be5a70..4dd472b 100644
--- a/ft_putstr_fd.c
+++ b/ft_putstr_fd.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 20:43:05 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/06 20:45:40 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:20:16 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <unistd.h>
+#include "libft.h"
 
 void	ft_putstr_fd(char *s, int fd)
 {
diff --git a/ft_strchr.c b/ft_strchr.c
index 0b20bb4..ecf522e 100644
--- a/ft_strchr.c
+++ b/ft_strchr.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 14:12:39 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 16:10:27 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:15:56 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 char	*ft_strchr(const char *s, int c)
 {
 	int	i;
@@ -21,15 +23,18 @@ char	*ft_strchr(const char *s, int c)
 			return ((char *)&s[i]);
 		i++;
 	}
-	if (!c)
+	if (!(char)c)
 		return ((char *)&s[i]);
 	return (0);
 }
 
 /* #include <stdio.h> */
 /* #include <string.h> */
-/* int main() { */
-/*     char str[] = "Hello world"; */
-/*     printf("strchr: %s\n", strchr(str, 'o')); */
-/*     printf("ft_strchr: %s\n", ft_strchr(str, 'o')); */
+
+/* int	main(void) */
+/* { */
+/* 	char	str[] = "teste"; */
+
+/* 	printf("strchr: %p\n", strchr(str, '\0')); */
+/* 	printf("ft_strchr: %p\n", ft_strchr(str, '\0')); */
 /* } */
diff --git a/ft_strdup.c b/ft_strdup.c
index af7ab12..1282c36 100644
--- a/ft_strdup.c
+++ b/ft_strdup.c
@@ -6,33 +6,38 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 19:54:16 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/06 20:24:51 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:17:47 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <stdlib.h>
+#include "libft.h"
 
 char	*ft_strdup(const char *s1)
 {
 	char	*result;
 	int		len;
+	int		i;
 
 	len = 0;
-	while (*(s1++))
+	while (s1[len])
 		len++;
 	result = malloc(len + 1);
 	if (!result)
 		return (0);
-	result[++len] = '\0';
-	while (len--)
-		result[len] = *(--s1);
+	result[len] = '\0';
+	i = 0;
+	while (i < len)
+	{
+		result[i] = s1[i];
+		i++;
+	}
 	return (result);
 }
 
 /* #include <stdio.h> */
 /* int main() { */
 /*     char *output; */
-/*     char input[] = "Dies ist ein Test."; */
+/*     char input[] = "test"; */
 /*     output = ft_strdup(input); */
 /*     printf("%s\n", output); */
 /* } */
diff --git a/ft_strjoin.c b/ft_strjoin.c
index c399c87..ebcd611 100644
--- a/ft_strjoin.c
+++ b/ft_strjoin.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/07 10:15:33 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 14:11:30 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:18:27 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <stdlib.h>
+#include "libft.h"
 
 static int	get_len(char const *s)
 {
diff --git a/ft_strlcat.c b/ft_strlcat.c
index 0ce0e19..d49dfad 100644
--- a/ft_strlcat.c
+++ b/ft_strlcat.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 13:36:59 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 16:09:50 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:15:10 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 /* size_t	ft_strlcat(char *dst, const char *src, size_t dstsize) */
 /* { */
diff --git a/ft_strlcpy.c b/ft_strlcpy.c
index b4f6abc..1cc62e5 100644
--- a/ft_strlcpy.c
+++ b/ft_strlcpy.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 12:45:25 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 14:01:05 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:14:56 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 size_t	ft_strlcpy(char *dst, const char *src, size_t dstsize)
 {
diff --git a/ft_strlen.c b/ft_strlen.c
index e201765..867c5eb 100644
--- a/ft_strlen.c
+++ b/ft_strlen.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/04 21:29:35 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/04 21:31:24 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:11:48 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_strlen(const char *str)
 {
 	int	len;
diff --git a/ft_strncmp.c b/ft_strncmp.c
index af24b2a..9d30ee7 100644
--- a/ft_strncmp.c
+++ b/ft_strncmp.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 14:45:10 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 14:26:15 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:16:10 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 int	ft_strncmp(const char *s1, const char *s2, size_t n)
 {
diff --git a/ft_strnstr.c b/ft_strnstr.c
index 2b96b64..54868d4 100644
--- a/ft_strnstr.c
+++ b/ft_strnstr.c
@@ -6,21 +6,23 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 16:07:54 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 16:40:20 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:16:58 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <string.h>
+#include "libft.h"
 
 char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
 {
 	size_t	i;
 	size_t	k;
 
+	if (len < 0 || (!haystack[0] && needle[0]))
+		return (0);
 	i = 0;
 	if (*needle == '\0' || needle == haystack)
 		return ((char *)haystack);
-	while (i < len)
+	while (i < len && haystack[i])
 	{
 		k = 0;
 		while (haystack[i + k] && haystack[i + k] == needle[k] && i + k < len)
@@ -38,9 +40,10 @@ char	*ft_strnstr(const char *haystack, const char *needle, size_t len)
 
 /* int	main(void) */
 /* { */
-/* 	char	haystack[] = "M"; */
-/* 	char	needle[] = "MZIRIBMZE"; */
+/* 	char	haystack[] = "abc"; */
+/* 	char	needle[] = "abcde"; */
+/* 	size_t	len = 5; */
 
-/* 	printf("strnstr: %s\n", strnstr(haystack, haystack, 2)); */
-/* 	printf("ft_strnstr: %s\n", ft_strnstr(haystack, haystack, 2)); */
+/* 	printf("strnstr: %s\n", strnstr(haystack, needle, len)); */
+/* 	printf("ft_strnstr: %s\n", ft_strnstr(haystack, needle, len)); */
 /* } */
diff --git a/ft_strrchr.c b/ft_strrchr.c
index ac0d0ab..5d31654 100644
--- a/ft_strrchr.c
+++ b/ft_strrchr.c
@@ -6,7 +6,7 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 14:25:30 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 14:09:13 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 12:51:38 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -23,7 +23,7 @@ char	*ft_strrchr(const char *s, int c)
 			last_occurrence = (char *)&s[i];
 		i++;
 	}
-	if (!c)
+	if (!(char)c)
 		last_occurrence = (char *)&s[i];
 	return (last_occurrence);
 }
diff --git a/ft_strtrim.c b/ft_strtrim.c
index 933987b..ff4056e 100644
--- a/ft_strtrim.c
+++ b/ft_strtrim.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/07 10:24:17 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 14:47:40 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:18:40 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <stdlib.h>
+#include "libft.h"
 
 static int	is_in(char c, const char *str)
 {
diff --git a/ft_substr.c b/ft_substr.c
index f5ee2aa..bf65c8d 100644
--- a/ft_substr.c
+++ b/ft_substr.c
@@ -6,11 +6,11 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 21:58:31 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 14:55:55 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:18:11 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#include <stdlib.h>
+#include "libft.h"
 
 char	*ft_substr(char const *s, unsigned int start, size_t len)
 {
@@ -20,20 +20,19 @@ char	*ft_substr(char const *s, unsigned int start, size_t len)
 	i = 0;
 	while (s[i])
 		i++;
+	if (start >= i)
+		len = 0;
 	if (i - start < len)
 		len = (i - start);
-	if (start >= len)
-		len = 0;
 	result = malloc(len + 1);
-	if (result)
+	if (!result)
+		return (0);
+	result[len] = '\0';
+	i = 0;
+	while (i < len)
 	{
-		result[len] = '\0';
-		i = 0;
-		while (i < len)
-		{
-			result[i] = s[i + start];
-			i++;
-		}
+		result[i] = s[i + start];
+		i++;
 	}
 	return (result);
 }
@@ -42,6 +41,6 @@ char	*ft_substr(char const *s, unsigned int start, size_t len)
 /* int main () */
 /* { */
 /*     char s[] = "Hello there"; */
-/*     char *substr = ft_substr(s, 25, 10); */
+/*     char *substr = ft_substr(s, 0, 2); */
 /*     printf("%s\n", substr); */
 /* } */
diff --git a/ft_tolower.c b/ft_tolower.c
index 31e848f..c81b9ef 100644
--- a/ft_tolower.c
+++ b/ft_tolower.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/04 21:49:28 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/06 11:49:49 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:15:39 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_tolower(int c)
 {
 	if (c >= 'A' && c <= 'Z')
diff --git a/ft_toupper.c b/ft_toupper.c
index 5082232..51e4ba6 100644
--- a/ft_toupper.c
+++ b/ft_toupper.c
@@ -6,10 +6,12 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/04 21:33:34 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/04 21:49:16 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:15:26 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
+#include "libft.h"
+
 int	ft_toupper(int c)
 {
 	if (c >= 'a' && c <= 'z')
diff --git a/libft.h b/libft.h
index 8fa6fd4..e646b9e 100644
--- a/libft.h
+++ b/libft.h
@@ -6,12 +6,16 @@
 /*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/03/06 21:38:24 by dkaiser           #+#    #+#             */
-/*   Updated: 2024/03/07 16:23:00 by dkaiser          ###   ########.fr       */
+/*   Updated: 2024/03/10 13:26:25 by dkaiser          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
-#ifndef LIBFT_H_
-# define LIBFT_H_
+#ifndef LIBFT_H
+# define LIBFT_H
+
+# include <stdlib.h>
+# include <string.h>
+# include <unistd.h>
 
 int		ft_isalpha(int c);
 int		ft_isdigit(int c);