HTML Entity Parser LeetCode solution in C++

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class Solution {
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 public:
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  string entityParser(string text) {
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    map<string, char> mp;
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    mp["&quot;"] = '\"';
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    mp["&apos;"] = '\'';
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    mp["&amp;"] = '&';
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    mp["&gt;"] = '>';
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    mp["&lt;"] = '<';
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    mp["&frasl;"] = '/';
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    for (int i = 0; i < text.size(); i++) {
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      if (text[i] == '&') {
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        int j = i;
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        string com = "";
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        while (text[j] != ';' && j < text.size()) {
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          com += text[j];
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          j++;
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        }
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        com += text[j];
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        if (mp.find(com) != mp.end()) {
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          text.erase(i, j - i);
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          text[i] = mp[com];
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        }
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      }
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    }
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    return text;
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  }
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};