#include <string_view>

auto trim(std::string_view sv, std::string_view delimiters = " \t\r\n")
{
  sv.remove_prefix(std::min(sv.find_first_not_of(delimiters), sv.size()));
  auto pos = sv.find_last_not_of(delimiters); 
  if (pos != sv.npos) sv.remove_suffix(sv.size() - (pos + 1));
  return sv;
}