Substring #GoLang

substring.go

//Original
func substr(s string,pos,length int) string{
    bytes:=[]byte(s)
    l := pos+length
    if l > len(bytes) {
        l = len(bytes)
    }
    return string(bytes[pos:l])
}

//Simply
s[pos:length]

//[]byte -> []rune
//Correct version
func substr(s string,pos,length int) string{
    runes:=[]rune(s)
    l := pos+length
    if l > len(runes) {
        l = len(runes)
    }
    return string(runes[pos:l])
}