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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def build_command(self):
 """Build out the crontab command"""

        return cron_utils.cronify("crontab -l | {{ cat; echo \"{} {} {} {} {} CJOBID='{}' MAILTO='' {}\"; }} | crontab - > /dev/null".format(self._minute, self._hour, self._day_of_month, self._month_of_year, self._day_of_week, self._jobid, self._command))