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Continue to Chatstd::move = std::optional이 출동할 때 https://rmag.eu/stdmove-stdoptional%ec%9d%b4-%ec%b6%9c%eb%8f%99%ed%95%a0-%eb%95%8c/
std::move = std::optional이 출동할 때 https://rmag.eu/stdmove-stdoptional%ec%9d%b4-%ec%b6%9c%eb%8f%99%ed%95%a0-%eb%95%8c/