STRING1  :        011011110011000

STRING2  :        011001000001000

EXPECTED OUTPUT : 000010110010000

for(int i = 0; i<15; i++)
 {
    final_key[i] = STRING1[i] ^ STRING2[i];
    cout<<" XOR = "<<final_key[i];
 }

final_key[i] = ((STRING1[i]-'0') ^ (STRING2[i]-'0')) + '0';

#incude <string>
#incude <bitset>
#incude <iostream>

int main()
{
    std::string s1 = "010101010101010101";
    std::string s2 = "101010101000001111";

    auto result = std::bitset<32>(s1) ^ std::bitset<32>(s2);
    std::cout << result << std::endl;
}

char result = std::abs(a - b) + '0';

string strings_xor(string s, string t) {

string res = "";
for(int i = 0; i < s.size(); i++) {
    if(s[i] == t[i])
        res += '0';
    else
        res += '1';
}

return res;

string s1="011011110011000";
string s2="011001000001000";
char final_key[15];
for(int i = 0; i<15; i++)
 {
final_key[i] = (s1[i] ^ s2[i])+'0'; //paranthesis is important
cout<<final_key[i];
}

final_key[i]=(s1[i]!=s2[i]?'1':'0');