Function startsWith

Bcore/src/main/cpp/Dobby/tests/catch.hpp:9499–9501

namespace Catch {

bool startsWith(std::string const &s, std::string const &prefix) {
  return s.size() >= prefix.size() && std::equal(prefix.begin(), prefix.end(), s.begin());
}
bool startsWith(std::string const &s, char prefix) {
  return !s.empty() && s[0] == prefix;
}