Masking Personal Information LeetCode solution in C++

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class Solution {
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 public:
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  string email(string &s, int id) {
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    string t = string(1, s[0] | ' ') + "*****" + string(1, s[id - 1] | ' ');
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    for (int i = id + 1; i != s.size(); i++)
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      if (s[i] != '.') s[i] |= ' ';
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    return t + s.substr(id, s.size());
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  }
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  string phone(string &s) {
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    string table[] = {"", "+*-", "+**-", "+***-"}, t;
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    for (auto &ch : s)
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      if (ch >= '0' && ch <= '9') t.push_back(ch);
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    return table[t.size() - 10] + "***-***-" + t.substr(t.size() - 4, 4);
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  }
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  string maskPII(string s) {
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    int id = s.find('@');
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    return id == -1 ? phone(s) : email(s, id);
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  }
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};