Detecting a specific character string

Question

Recently, I had a school project that made me struggle for a week. I really need help.

My program takes a string input and modifies it to return another string in its upper or lower case version, so far it works. But when I put in : "This is so exciting (up, 2)" the output stays the same when it should be "This is SO EXCITING" My point is to be able to handle the case : (up, n), knowing that the word followed by "(up)" must be capitalized. If below you will find the concerned function.

Thanks in advance !

// modifyUp converts words before (up) to uppercase
func modifyUp(line string) string {
    words := strings.Fields(line)
    var numWords int
    var numbers int

    for i, word := range words {
        if strings.HasSuffix(word, "(up)") && i > 0 {
            // Convert word(s) to uppercase
            numWords = 1
            if strings.Contains(word, ",") {
                // Handle comma-separated words
                numbers, _ = strconv.Atoi(strings.TrimSuffix(strings.Split(word, ",")[1], ")"))
                word = strings.TrimSuffix(word, fmt.Sprintf(",%d)", numbers))
                numWords += numbers
            } else {
                word = strings.TrimSuffix(word, "(up)")
            }
            // Convert preceding word(s) to uppercase
            for j := i - numWords + 1; j <= i; j++ {
                if j >= 0 {
                    words[j] = strings.ToUpper(words[j])
                }
            }
            // Replace modified word with original word
            words[i-numWords+1] = word
        }
    }
    return strings.Join(words, " ")

Answer 1

I finally found another way

func modifyUp(line string) string {
    words := strings.Fields(line)
    //var numWords int
    var numbers int

    for i, word := range words {
        if word == "(up," && i < len(words)-1 {
            ok := splitWord(words[i+1])
            if ok {
                wr := words[i+1]
                numbers, _ = strconv.Atoi(wr[:len(wr)-1])
                words[i], words[i+1] = "", ""
                for j := i - 1; j >= 0; j-- {
                    if numbers == 0 {
                        break
                    } else {
                        words[j] = strings.ToUpper(words[j])
                        numbers--
                    }
                }
            }
            break
        }
        if word == "(up)" && i > 0 {
            words[i-1] = strings.ToUpper(words[i-1])
            words[i] = ""
        }
    }

    return strings.Join(words, " ")
}

Thank all you for contibutions