utils

static std::vector split(const std::string &s, char delim)
{
std::vector elems;
std::stringstream ss(s);
std::string item;
while (std::getline(ss, item, delim)) {
if (!item.empty())
elems.push_back(item);
}
return elems;
}

static bool iequals(const std::string& a, const std::string& b)
{
  unsigned int sz = a.size();
  if (b.size() != sz)
return false;
  for (unsigned int i = 0; i < sz; ++i)
if (std::tolower(a[i]) != std::tolower(b[i]))
  return false;
  return true;
}