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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 get_function_name(integration_uri):
 """ Gets the name of the function from the Integration URI ARN. This is a best effort service which returns None if function name could not be parsed. This can happen when the ARN is an intrinsic function which is too complex or the ARN is not a Lambda integration. Parameters integration_uri : basestring or dict Integration URI data extracted from Swagger dictionary. This could be a string of the ARN or an intrinsic function that will resolve to the ARN Returns ------- basestring or None If the function name could be parsed out of the Integration URI ARN. None, otherwise """


        arn = LambdaUri._get_function_arn(integration_uri)

        LOG.debug("Extracted Function ARN: %s", arn)

        return LambdaUri._get_function_name_from_arn(arn)