What's wrong with my recursive function written in go?

I am learning golang through the book "the go Programming Language", in Chapter 5, Section 5.3 (Multiple Return Values) In Exercise 5.5, I have to implement the function countwordandimages, which is from the (golang.org/x/net) package, and count the number of words and images in the html file, I implemented the following function, but I get an error For some reason, I'm receiving a 0 value for each words and images return variable.

func countWordsAndImages(n *html.Node) (words, images int) {
    if n.Type == html.TextNode {
        words += wordCount(n.Data)
    } else if n.Type == html.ElementNode && n.Data == "img" { // if tag is img on element node
        images++
    }
    for c := n.FirstChild; c != nil; c = n.NextSibling {
        tmp_words, tmp_images := countWordsAndImages(c)
        words, images = words+tmp_words, images+tmp_images
    }
    return words, images
}

func wordCount(s string) int {
    n := 0
    scan := bufio.NewScanner(strings.NewReader(s))
    scan.Split(bufio.ScanWords)
    for scan.Scan() {
        n++
    }
    return n
}

(int, int)) in the function.

c.nextsibling to advance to the next sibling instead of n.nextsibling:

for c := n.FirstChild; c != nil; c = c.NextSibling {
    ⋮

//m.sbmmt.com/link/e7364a5abd2a860cf8e33b114369b92b

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