diff --git a/.gitignore b/.gitignore
index 927e2b2..8e736c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
 *.o
-*.c
 *.out
 *.a
\ No newline at end of file
diff --git a/Makefile b/Makefile
index c11a989..1edd1d9 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,8 @@ SRCS = ft_strlen.s \
 		ft_read.s    \
 		ft_strcpy.s   \
 		ft_strcmp.s    \
-		
+		ft_strdup.s     \
+
 OBJS = ${SRCS:.s=.o}
 
 CC = nasm
diff --git a/ft_read.s b/ft_read.s
index 6aed3c1..7522ee8 100644
--- a/ft_read.s
+++ b/ft_read.s
@@ -1,7 +1,7 @@
-global _read
+global ft_read
 extern __errno_location
 
-_read:
+ft_read:
 	mov eax, 0x11
 	syscall
 	test rax, rax
diff --git a/ft_strcmp.s b/ft_strcmp.s
index bfc9dfa..93bc1b7 100644
--- a/ft_strcmp.s
+++ b/ft_strcmp.s
@@ -1,9 +1,10 @@
-extern _strcmp
+global ft_strcmp
+extern _malloc
 
-
-_strcmp:
+ft_strcmp:
 	xor rax, rax
 	xor rbx, rbx
+
 .count:
 	mov rax, [rdi + rbx]
 	sub rax, [rsi + rbx]
@@ -13,4 +14,4 @@ _strcmp:
 	jmp .count
 
 .end: 
-	ret
+	ret
\ No newline at end of file
diff --git a/ft_strcpy.s b/ft_strcpy.s
index 82dfb2f..d2ea71d 100644
--- a/ft_strcpy.s
+++ b/ft_strcpy.s
@@ -1,10 +1,10 @@
-extern _strcpy
+global ft_strcpy
 
-_strcpy:
+ft_strcpy:
 	xor rbx, rbx
 
 .cpy:
-	cmp dword [rsi + rbx], 0
+	cmp byte [rsi + rbx], 0
 	je .end
 	mov rax, [rsi + rbx]
 	mov [rdi + rbx], rax
@@ -12,5 +12,6 @@ _strcpy:
 	jmp .cpy
 
 .end:
+	mov byte [rdi + rbx], 0
 	mov rax, rdi
 	ret
diff --git a/ft_strdup.s b/ft_strdup.s
new file mode 100644
index 0000000..e790de2
--- /dev/null
+++ b/ft_strdup.s
@@ -0,0 +1,25 @@
+global ft_strdup
+
+extern ft_strlen
+extern ft_strcpy
+extern malloc
+extern __errno_location
+
+ft_strdup:
+    cmp rdi, 0
+    je .end
+    mov r12, rdi
+    call ft_strlen
+    inc rax
+    mov rdi, rax
+    call malloc wrt ..plt
+    test rax, rax
+    je .end
+    mov rdi, rax
+    mov rsi, r12
+    call ft_strcpy
+    ret
+
+.end:
+    xor rax, rax
+    ret
\ No newline at end of file
diff --git a/ft_strlen.s b/ft_strlen.s
index 0b1a5b4..b9d2a94 100644
--- a/ft_strlen.s
+++ b/ft_strlen.s
@@ -1,11 +1,13 @@
-global _strlen
+global ft_strlen
 
-_strlen:
+ft_strlen:
 	xor rax, rax
+
 .cmp_char:
 	cmp byte [rdi + rax], 0
 	je .end
 	inc rax
 	jmp .cmp_char
+
 .end:
 	ret
\ No newline at end of file
diff --git a/ft_write.s b/ft_write.s
index 50a29db..f0cb24a 100644
--- a/ft_write.s
+++ b/ft_write.s
@@ -1,7 +1,7 @@
-global _write
+global ft_write
 extern __errno_location
 
-_write:
+ft_write:
 	mov eax, 0x1
 	syscall
 	test rax, rax
diff --git a/libasm.a b/libasm.a
index 39ce1eb..5ed300b 100644
Binary files a/libasm.a and b/libasm.a differ
diff --git a/test.c b/test.c
new file mode 100644
index 0000000..4c9f780
--- /dev/null
+++ b/test.c
@@ -0,0 +1,102 @@
+#include <string.h>
+#include <strings.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+
+extern ssize_t ft_write(int fd, const void *buf, size_t count);
+
+extern int ft_strcmp(const char *s1, const char *s2);
+
+extern char *ft_strcpy(char *dest, const char *src);
+
+extern size_t ft_strlen(const char *s);
+
+extern ssize_t ft_read(int fd, void *buf, size_t count); 
+
+extern char *ft_strdup(const char *s);
+
+void Test_read(char *filename, int len)
+{
+    char buffer[100] = {0};
+
+    int fd = open(filename, O_RDONLY);
+    printf("READ : %ld | ", read(fd, buffer, len));
+    printf("%s\n", buffer);
+    close(fd);
+    bzero(buffer, len);
+
+    fd = open(filename, O_RDONLY);
+    printf("READ : %ld | ", ft_read(fd, buffer, len));
+    printf("%s\n", buffer);
+    close(fd);
+}
+
+void Test_write(char *buffer, int len)
+{
+    printf(" | WRITE : %ld\n", write(1, buffer, len));
+    printf(" | WRITE : %ld\n", ft_write(1, buffer, len));
+}
+
+void Test_strdup(char *buffer)
+{
+    char *newbuffer;
+
+    newbuffer = strdup(buffer);
+    printf("STRDUP : %s\n", newbuffer);
+    free(newbuffer);
+
+    newbuffer = ft_strdup(buffer);
+    printf("FT_STRDUP : %s\n", newbuffer);
+    free(newbuffer);
+}
+
+void Test_strlen(char *str)
+{
+    int len = strlen(str);
+    int ft_len = ft_strlen(str);
+
+    printf("STRLEN : %s\n", (len == ft_len) ? "OK" : "KO");
+}
+
+void Test_strcpy(char *buffer)
+{
+    char cpybuffer[strlen(buffer) + 1];
+
+    bzero(cpybuffer, strlen(buffer) + 1);
+    strcpy(cpybuffer, buffer);
+    printf("STRCPY : %s\n", cpybuffer);
+
+    bzero(cpybuffer, strlen(buffer) + 1);
+    ft_strcpy(cpybuffer, buffer);
+    printf("FT_STRCPY : %s\n", cpybuffer);
+}
+
+void Test_strcmp(char *str1, char *str2)
+{
+    int res1 = strcmp(str1, str2);
+    int res2 = ft_strcmp(str1, str2);
+
+    printf("STRCMP : %d FT_STRCMP : %d | %s\n", res1, res2, (res1 == res2) ? "OK" : "KO");
+}
+
+int main()
+{
+    int returnval[2];
+    int fd = open("mauvaisdavid.txt", O_RDONLY);
+    char buffer[100] = {0};
+
+    Test_strlen("clafete");
+
+    Test_read("mauvaisdavid.txt", 15);
+
+    Test_write("youpipouic", 10);
+
+    Test_strcpy("jesuislevilainbebe");
+
+    Test_strdup("youpilolololol");
+
+    Test_strcmp("vilain", "vilain");
+}
\ No newline at end of file