add other basic functions and test with them

srcs/ft_strdup.s

@@ -0,0 +1,31 @@
+extern malloc
+global ft_strdup
+extern ft_strcpy
+extern ft_strlen
+extern __errno_location
+section .text
+
+ft_strdup:
+	test rdi, rdi ; test if arg is NULL
+	je err
+
+	push rdi ;push to use it for the strcpy
+	call ft_strlen
+	mov rdi, rax
+
+	call malloc wrt ..plt
+	test rax, rax
+	je malloc_failed
+	mov rdi, rax
+	pop rsi
+	call ft_strcpy
+	ret
+
+malloc_failed:
+	call __errno_location wrt ..plt
+	mov dword [rax], 12
+	pop rax
+
+err:
+	xor rax, rax
+	ret