Scan files which extensions is not lowercase

src/libs/utils/impl/String.cpp

@@ -104,11 +104,17 @@ stringToLower(std::string_view str)
 	std::string res;
 	res.reserve(str.size());
 
-	std::transform(std::cbegin(str), std::cend(str), std::back_inserter(res), [](char c) { return std::tolower(c);});
+	std::transform(std::cbegin(str), std::cend(str), std::back_inserter(res), [](unsigned char c) { return std::tolower(c);});
 
 	return res;
 }
 
+void
+stringToLower(std::string& str)
+{
+	std::transform(std::cbegin(str), std::cend(str), std::begin(str), [](unsigned char c) { return std::tolower(c);});
+}
+
 std::string
 stringToUpper(const std::string& str)
 {