static boolean hasPackage(@NotNull String className, @NotNull String packageName){
    if (!className.startsWith(packageName)) return false;
    if (className.length() == packageName.length()) return false;
    if (!packageName.isEmpty() && className.charAt(packageName.length()) != '.') return false;
    return className.indexOf('.', packageName.length() + 1) < 0;
  }
static boolean hasPackage(@NotNull String className, @NotNull String packageName)