0014-longest-common-prefix.go

func longestCommonPrefix(strs []string) string {
    var res strings.Builder
    for i := 0; i < len(strs[0]); i++ {
        for _, s := range(strs) {
            if i == len(s) || s[i] != strs[0][i] {
                return res.String()
            }
        }
        res.WriteByte(strs[0][i])
    }
    return res.String()
}