Capitalize the Title LeetCode solution in C++

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class Solution {
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 public:
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  string capitalize(string s) {
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    transform(s.begin(), s.end(), s.begin(), ::tolower);
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    if (s.length() <= 2) {
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      return s;
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    }
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    s[0] = s[0] - 'a' + 'A';
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    return s;
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  }
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  string capitalizeTitle(string title) {
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    string str = "";
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    string ans = "";
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    for (int i = 0; i < title.length(); i++) {
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      if (title[i] != ' ') {
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        str.push_back(title[i]);
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      } else {
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        str = capitalize(str);
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        ans += str + " ";
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        str = "";
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      }
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    }
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    str = capitalize(str);
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    ans += str;
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    return ans;
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  }
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};