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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_integration_function_name(self, method_config):
 """ Tries to parse the Lambda Function name from the Integration defined in the method configuration. Integration configuration is defined under the special "x-amazon-apigateway-integration" key. We care only about Lambda integrations, which are of type aws_proxy, and ignore the rest. Integration URI is complex and hard to parse. Hence we do our best to extract function name out of integration URI. If not possible, we return None. Parameters method_config : dict Dictionary containing the method configuration which might contain integration settings Returns ------- string or None Lambda function name, if possible. None, if not. """

        if not isinstance(method_config, dict) or self._INTEGRATION_KEY not in method_config:
            return None

        integration = method_config[self._INTEGRATION_KEY]

        if integration \
                and isinstance(integration, dict) \
                and integration.get("type") == IntegrationType.aws_proxy.value:
            # Integration must be "aws_proxy" otherwise we don't care about it
            return LambdaUri.get_function_name(integration.get("uri"))