processPunctuation(string& tag){  std::set<char> punctuation_set;  punctuation_set.insert(' ');  punctuation_set.insert('/t');  punctuation_set.insert(';');  for (int i=0; i< tag.size(); i++) {    if (punctuation_set.find(tag[i]) != punctuation_set.end())     {      tag[i] = ',';    }  }  return;}

processChinesePunctuation(string& tag){  string u8comma = u8"，";  for (int i = 0; i < tag.size() - u8comma.size() + 1; i++)  {    bool find = true;    // 查找空格依賴于 UTF-8 的特性    for (int j = 0; j < u8comma.size(); j++)    {      if (tag[i + j] != u8comma[j])      {        find = false;        break;      }    }      if (find)    {      // 替換為 ,      tag[i] = ',';      auto it = tag.begin();      it += i + 1;      for (int j = 1; j < u8comma.size(); j++)        it = tag.erase(it);    }  }  return;}