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	std::string Capitalize(std::string str) {			std::string Capitalize(std::string str) {
	if (str.empty()) {			if (str.empty()) {
	return str;			return str;
	}			}
	str[0] = ToUpper(str.front());			str[0] = ToUpper(str.front());
	return str;			return str;
	}			}

				std::string HexStr(const Span<const uint8_t> s) {
				std::string rv;
				static constexpr char hexmap[16] = {'0', '1', '2', '3', '4', '5', '6', '7',
				'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
				rv.reserve(s.size() * 2);
				for (uint8_t v : s) {
				rv.push_back(hexmap[v >> 4]);
				rv.push_back(hexmap[v & 15]);
				}
				return rv;
				}