Defanging an IP Address LeetCode solution in C++

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class Solution {
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 public:
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  string defangIPaddr(string address) {
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    string res;
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    for (int i = 0; i < address.length(); i++) {
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      if (address[i] == '.') {
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        res += "[.]";
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      } else {
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        res += address[i];
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      }
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    }
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    return res;
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  }
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};