code: func (d *Data) SetDirName(path, filename string, procs int) {
  	if path == "" {
  		d.dirname = fmt.Sprintf("_%s.%d", filename, procs)
  	} else {
  		d.dirname = fmt.Sprintf("%s/_%s.%d", path, filename, procs)
  	}
  
  }
docs: // SetDirName set to Data structs member