How to remove special char in golang when reading file?

I have a file like this:
Each line represents a Website

1 www.google.com$
2 www.apple.com$
3 www.facebook.com$

I read it in golang like this:

type ListConf struct {
    File  string
    Datas map[string]struct{}
}

func loadListConf(conf *ListConf, path string) {
    file, err := os.Open(path + "/" + conf.File)
    if err != nil {
	    fmt.Println("Load conf " + conf.File + " error: " + err.Error())
	    return
    }
    defer file.Close()
    conf.Datas = make(map[string]struct{})
    buf := bufio.NewReader(file)
    end := false
    for !end {
	    line, err := buf.ReadString('\n')
	    if err != nil {
		    if err != io.EOF {
			    fmt.Println("Load conf " + conf.File + " error: " + err.Error())
			    return
		    } else {
			    end = true
		    }
	    }
	    item := strings.Trim(line, "\n")
	    if item == "" {
		    continue
	    }
	    conf.Datas[item] = struct{}{}
    }
}

But when I search key such like "www.google.com" in the map, it shows that there is not a "www.google.com" in the map.

website := "www.google.com"
if _, ok := conf.Datas[website]; ok {
    fmt.Printf("%s is in the map.", website)
} else {
    fmt.Printf("%s is not in the map.", website)
}

It print "www.google.com is not in the map".
I found that a ^M in the end of each key in the map, my question is how can I remove the ^M character?

www.google.com^M
www.apple.com^M
www.facebook.com^M

The default line separator in text files on Windows is a sequence of two characters: \r\n. ^M character that you see in your strings is \r.

bufio.Scanner can take care of splitting the input into lines in a platform independent way:

scanner := bufio.NewScanner(file)
for scanner.Scan() {
	fmt.Println(scanner.Text())
}
if err := scanner.Err(); err != nil {
	fmt.Fprintln(os.Stderr, "error reading from the file:", err)
}

Less elegant but...

You can strip the \r from the end of the string with:

        line, err := buf.ReadString('\n')
        line = strings.TrimRight(line, "\r")

It will remove multiple \r (^M) and is a no-op if there are none.