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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_rrule_from_dateutil_rrule(rule):
 """ Build rrule dictionary for vRecur class from a dateutil rrule. Dateutils rrule is a popular implementation of rrule in python. https://pypi.org/project/python-dateutil/ this is a shortcut to interface between dateutil and icalendar. """

    lines = str(rule).splitlines()
    for line in lines:
        if line.startswith('DTSTART:'):
            continue
        if line.startswith('RRULE:'):
            line = line[6:]
        return build_rrule_from_text(line)