global ft_strdup
extern malloc
extern ft_strlen
extern ft_strcpy

ft_strdup:
	push rdi ; save string to available register 
	call ft_strlen
	mov rdi, rax
	inc rdi ; null terminated
	call malloc WRT ..plt
	cmp rax, 0 ; if malloc failed
	jz .error
	mov rdi, rax ; store malloc adress to dest
	pop rsi ; restore string address to source 
	call ft_strcpy
	jmp .done

.error:
	pop rsi ; restore stack bc we skipped line #15

.done:
	ret