leetcode-1807. 替换字符串中的括号内容

func evaluate(s string, knowledge [][]string) string {

    var know =  map[string]string{}

    for _, v := range knowledge {

        know[v[0]] = v[1]

    }

    slen := len(s)

    var ans strings.Builder

    for i:=0;i < slen; i++ {

        if s[i] == '(' {

            for j:= i+1; j< slen; j++ {

                if s[j] == ')'{

                    if v, ok:= know[s[i+1:j]]; ok {

                        ans.WriteString(v)

                    }else {

                        ans.WriteByte('?')

                    }

                    i = j

                    break;

                }

            }

            continue

        }

        ans.WriteByte(s[i])

    }

    return ans.String()

}