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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 normalize_request_headers(request):
 r"""Function used to transform header, replacing 'HTTP\_' to '' and replace '_' to '-' :param request: A HttpRequest that will be transformed :returns: A dictionary with the normalized headers """

    norm_headers = {}
    for header, value in request.META.items():
        if required_header(header):
            norm_header = header.replace('HTTP_', '').title().replace('_', '-')
            norm_headers[norm_header] = value

    return norm_headers