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题目：

题解：

func licenseKeyFormatting(s string, k int) string {ans := []byte{}for i, cnt := len(s)-1, 0; i >= 0; i-- {if s[i] != '-' {ans = append(ans, byte(unicode.ToUpper(rune(s[i]))))cnt++if cnt%k == 0 {ans = append(ans, '-')}}}if len(ans) > 0 && ans[len(ans)-1] == '-' {ans = ans[:len(ans)-1]}for i, n := 0, len(ans); i < n/2; i++ {ans[i], ans[n-1-i] = ans[n-1-i], ans[i]}return string(ans)
}