utils: introduce trim()

utils.cpp

@@ -181,3 +181,20 @@ std::string utils::toISODate(time_t t)
 	}
 	return std::string{result};
 }
+
+std::string utils::trim(const std::string &str)
+{
+	std::string_view chars = " \t\n\r";
+	std::string_view view = str;
+	auto n = view.find_first_not_of(chars);
+	if(n != std::string_view::npos)
+	{
+		view.remove_prefix(n);
+	}
+	n = view.find_last_not_of(chars);
+	if(n != std::string_view::npos)
+	{
+		view.remove_suffix(view.size() - n - 1);
+	}
+	return std::string{view};
+}