我试图比较两个单独的文件充满了链接（约422行），并放置任何新的行/链接到第三个文件使用Golang。任何想法如何完成这一点？
我已经尝试了下面的代码来比较文档，但不断得到奇怪的结果（计数300新行时，它应该只有10），并没有存储任何新的链接，因为我不知道如何做到这一点。

// code to compare documents
func Compare() {
    // open the first document
    file1, err := os.Open("Links_New.txt")
    if err != nil {
        fmt.Println("Error opening file:", err)
        return
    }
    defer file1.Close()

    // open the second document
    file2, err := os.Open("Links_Old.txt")
    if err != nil {
        fmt.Println("Error opening file:", err)
        return
    }
    defer file2.Close()

    // create scanners for both documents
    scanner1 := bufio.NewScanner(file1)
    scanner2 := bufio.NewScanner(file2)

    // initialize a counter for the number of New lines
    NewLines := 0

    // loop through each line in the first file
    for scanner1.Scan() {
        // check if the line exists in the second file
        if scanner2.Scan() {
            if scanner1.Text() != scanner2.Text() {
                NewLines++
            }
        } else {
            break
        }
    }

    // check for errors while scanning
    if err := scanner1.Err(); err != nil {
        fmt.Println("Error scanning file:", err)
        return
    }
    if err := scanner2.Err(); err != nil {
        fmt.Println("Error scanning file:", err)
        return
    }

    // print the number of new lines
    fmt.Println("\n\n Number of new lines:", NewLines)
}

// code to transfer links new to old
func ReadWrite() {
    // Open the source file for reading
    src, err := os.Open("Links_New.txt")
    if err != nil {
        panic(err)
    }
    defer src.Close()

    // Open the destination file for writing
    dst, err := os.Create("Links_Old.txt")
    if err != nil {
        panic(err)
    }
    defer dst.Close()

    // Copy the contents of the source file to the destination file
    _, err = io.Copy(dst, src)
    if err != nil {
        panic(err)
    }
}