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// Case-insensitive string comparison
inline bool iequal(char c1, char c2) { return std::toupper(c1) == std::toupper(c2); }
bool iequals(const std::string& str1, const std::string& str2) {
  return  ((str1.size() == str2.size()) && std::equal(str1.begin(), str1.end(), str2.begin(), iequal));
}