static void normalizeLines(Strings& in, StringsSet& out, bool sortWords, bool ignoreBlankLines,
char wordsep = ' ') {
Strings::iterator begin = in.begin(), end = in.end(), i = begin, o = begin;
for (; i != end; ++i) {
std::string& line = *i;
normalizeLine(line, sortWords, wordsep);
bool empty = ignoreBlankLines && line.empty();
if (!empty) {
out.insert(line);
if (i != o) *o = std::move(*i);
++o;
}
}
in.erase(o, end);
}
