chore: rm unused string_utils file

src/lib/utils/string_utils.h

@@ -1,39 +0,0 @@
-/*
- * Deskflow -- mouse and keyboard sharing utility
- * Copyright (C) 2024 Symless Ltd.
- *
- * This package is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * found in the file LICENSE that should have accompanied this file.
- *
- * This package is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#pragma once
-
-#include <ranges>
-#include <string>
-
-const auto isNotSpace = [](unsigned char ch) { return !std::isspace(ch); };
-
-namespace deskflow::utils {
-
-/**
- * @brief A _very_ basic whitespace trimer.
- *
- * Ideally C++20 would have a std::trim function, but until then, this will do.
- */
-inline std::string trim(const std::string &str) {
-  auto front = std::ranges::find_if(str, isNotSpace);
-  auto back =
-      std::ranges::find_if(str | std::views::reverse, isNotSpace).base();
-  return (front < back ? std::string(front, back) : std::string{});
-}
-
-} // namespace deskflow::utils