#include <iostream>
#include <string>
[[nodiscard]] constexpr auto get_digits(const std::string& string) noexcept
{
std::string digits{};
for (const auto& character: string)
{
if (character < '0' || character > '9') [[likely]]
continue; // conditionally skips the following statement
digits += character;
}
return digits;
}
int main() noexcept
{
std::cout << get_digits("H3LL0, W0RLD!");
}
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