#include <iostream>
#include <string>
using namespace std;
 
std::string transform_url(std::string url)
{
	url += "aaa";
	return url;
}
 
const char * get_scheme_from_url(const std::string & url)
{
	return url.c_str();
}
 
std::string get_scheme_from_url(std::string && url) = delete;
 
const char* get_scheme(const std::string& url) {
    auto&& new_url = transform_url(url); // WTF
    return get_scheme_from_url(new_url); // still works, lol
}
 
int main() {
	// your code goes here
	cout << get_scheme("123") << endl; // uses freed memory
	return 0;
}

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