What is the output of the following code snippet? string reverse(string str, int start, int end) { } } if (start >= end) { return str; string string_reverse(string str) { } } char ch = str[start]; str[start] = str[end]; str[end]=ch; return reverse(str, start + 1, end - 1); int index = str.length() / 2; string str1 = reverse(str, 0, index 1); string str2 = reverse (str, index, str.length() - 1); int main() { string str3 = str1.substr(0, index); string str4 = str2.substr(index, str.length() index); return str3.append(str4); - cout<
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