def find_files_relative(directory, files)
      return [] unless files.any?
      files.each_with_object([]) do |file, obj|
        path = "#{directory}/#{file}"
        obj << path if File.exist?(path)
      end
    end
def find_files_relative(directory, files)
      return [] unless files.any?
      files.each_with_object([]) do |file, obj|
        path = "#{directory}/#{file}"
        obj << path if File.exist?(path)
      end
    end
Search list of files relative to given directory

 @param [String] directory   Main directory
 @param [Array]  files       List with Filenames

 @return [Array] List of path names of all found files