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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 simple_md2html(text, urls):
    ''' Convert a text from md to html '''
    retval = special_links_replace(text, urls)
    # Create a par break for double newlines
    retval = re.sub(r'\n\n', r'</p><p>', retval)
    # Create a visual br for every new line
    retval = re.sub(r'\n', r'<br />\n', retval)
    # Do we really need this ? Help reduce the diff to only '\n' diff.
    retval = re.sub(r'"', r'&quot;', retval)
    retval = list2html(retval)
    return link2html(retval)