import re


def preprocess_content(content):
    """Preprocessing the content you retrieve from the url

    Args:
        content (str): the content you get from url

    Returns:
        str: processed content
    """
    # Do some necessary preprocessing for the content retrieved from webside
    # - remove punctuations
    # - to lower case
    # - other operations if necessary
    content = re.sub(r'[^\w\s]','',content)
    return content.lower()