def create_full_path(file_name)
      path = full_path(file_name)
      FileUtils.mkdir_p(File.dirname(path))
      path
    end
def create_full_path(file_name)
      path = full_path(file_name)
      FileUtils.mkdir_p(File.dirname(path))
      path
    end
Creates the parent directory for the full path of generated file.

 === Parameters
 file_name(String):: output file name without extension

 === Return
 result(String):: full path of generated file