import re


def polished(summary):
    """ Polish summary, e.g. by cutting and trimming it.
    
    Args:
        summary: summary text to polish
    
    Returns:
        (part of) polished summary
    """
    first_sentence = re.search('.*\.', summary)
    if first_sentence:
        return first_sentence.group().strip()
    else:
        return summary.strip()