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void gamma(string s1, string s2, string &res)
{
	for (int i = 0; i < s1.length(); i++) {
		res[i] = (s1.c_str()[i]) ^ (s2.c_str()[i]);
	}
}
 

prog.cpp:1:12: error: variable or field 'gamma' declared void
 void gamma(string s1, string s2, string &res)
            ^
prog.cpp:1:12: error: 'string' was not declared in this scope
prog.cpp:1:23: error: 'string' was not declared in this scope
 void gamma(string s1, string s2, string &res)
                       ^
prog.cpp:1:34: error: 'string' was not declared in this scope
 void gamma(string s1, string s2, string &res)
                                  ^
prog.cpp:1:42: error: 'res' was not declared in this scope
 void gamma(string s1, string s2, string &res)
                                          ^

Standard output is empty