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function compareStringsbyBytes(string memory s1, string memory s2) public pure returns(bool){
return keccak256(abi.encodePacked(s1)) == keccak256(abi.encodePacked(s2));
}
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function compareStringsbyBytes(string s1, string s2) public pure returns(bool){
return keccak256(s1) == keccak256(s2);
}