Вынесена функция 2

(cherry picked from commit e23977fdf0c870d677f37902b3ad0de23dc67e12)

src/helpers/helpers.cpp

@@ -53,4 +53,25 @@ boost::beast::string_view MimeType(boost::beast::string_view path) {
     return "image/svg+xml";
   return "application/text";
 }
+
+std::string PathCat(boost::beast::string_view base, boost::beast::string_view path){
+  if (base.empty())
+    return std::string(path);
+  std::string result(base);
+#ifdef BOOST_MSVC
+  char constexpr path_separator = '\\';
+  if (result.back() == path_separator)
+    result.resize(result.size() - 1);
+  result.append(path.data(), path.size());
+  for (auto &c : result)
+    if (c == '/')
+      c = path_separator;
+#else
+  char constexpr path_separator = '/';
+  if (result.back() == path_separator)
+    result.resize(result.size() - 1);
+  result.append(path.data(), path.size());
+#endif
+  return result;
+}
 }