int binary$\_$to$\_$decimal$($string s$)\{$

$//$ you implement this

return $0$;

$\}$

string decimal$\_$to$\_$binary$($int n$)\{$

$//$ you implement this

return $"0"$;

$\}$

string add$\_$binaries$($string b$1,$ string b$2)\{$

$//$ you implement this

return $"0"$;

$\}$