Function needs_snake_separator

cpp/fory/util/string_util.h:208–225

}

constexpr bool needs_snake_separator(std::string_view name, size_t index) {
  if (index == 0)
    return false;
  char curr = name[index];
  if (!is_upper_ascii(curr))
    return false;

  char prev = name[index - 1];
  if (is_lower_ascii(prev) || is_digit_ascii(prev))
    return true;

  if (is_upper_ascii(prev) && index + 1 < name.size()) {
    char next = name[index + 1];
    if (is_lower_ascii(next))
      return true;
  }
  return false;
}

constexpr size_t snake_case_length(std::string_view name) {
  size_t length = 0;