length := fn(ptr: ^u8): int {
	len := 0
	loop if *(ptr + len) == 0 break else len += 1
	return len
}
display_int := fn(num: int, p: ^u8): ^u8 {
	ptr := p
	negative := num < 0
	if negative {
		num = -num
	}
	if num == 0 {
		*p = 48;
		*(p + 1) = 0
		return p
	}

	neg := false
	if num < 0 {
		neg = true
		num = -num
	}

	loop if num == 0 break else {
		*(p + i) = num % 10 + 48
		num /= 10
		i += 1
	}

	if neg {
		*(p + i) = 45
		i += 1
	}

	reverse(p, i)

	return p
}

reverse := fn(p: ^u8, len: int): void {
	start := 0
	end := len - 1
	loop if start >= end break else {
		temp := *(p + start);
		*(p + start) = *(p + end);
		*(p + end) = temp
		start += 1
		end -= 1
	}
	return
}