fix warning
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@ -46,7 +46,7 @@ contract MessageSigned {
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internal
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returns (bytes32 signHash)
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{
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signHash = keccak256("\x19Ethereum Signed Message:\n32", _hash);
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signHash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", _hash));
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}
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/**
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