code: def get_function_name(integration_uri):
          
  
          arn = LambdaUri._get_function_arn(integration_uri)
  
          LOG.debug("Extracted Function ARN: %s", arn)
  
          return LambdaUri._get_function_name_from_arn(arn)
docs: 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