```cpp
class Solution {
public:
string entityParser(string text) {
unordered_map<string, char> HashMap{
{""", '\"'},
{"'", '\''},
{"&", '&'},
{">", '>'},
{"<", '<'},
{"⁄", '/'}
};
string result;
for(auto i{0}; i< text.size();i++)
{
//如果当前字符不是'&'，就直接添加到结果字符串中
if(text[i] != '&'){
result += text[i];
continue;
}
auto sub_str = text.substr(i, 7);
auto found = false;
for (auto [key, value]: HashMap) {
//如果找到了对应的实体字符，就添加对应的字符到结果字符串中
if (sub_str.find(key) == 0) {
result += value;
i += key.size() - 1;
found = true;
break;
}
}
//如果没有找到对应的实体字符，就直接添加'&'
if(!found)
result += text[i];
}
return result;
}
};
```