You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: avro_specific_consumer_example.go
    path of file: ./repos/confluent-kafka-go/examples/avro_specific_consumer_example
    
    the code of the file until where you have to start completion: /**
 * Copyright 2022 Confluent Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// Example function-based high-level Apache Kafka consumer
package main

// consumer_example implements a consumer using the non-channel Poll() API
// to retrieve messages and events.

import (
	"fmt"
	"os"
	"os/signal"
	"syscall"

	"github.com/confluentinc/con
    
func main() {

	if len(os.Args) < 5 {
		fmt.Fprintf(os.Stderr, "Usage: %s <bootstrap-servers> <schema-registry> <group> <topics..>\n",
			os.Args[0])
		os.Exit(1)
	}

	bootstrapServers := os.Args[1]
	url := os.Args[2]
	group := os.Args[3]
	topics := os.Args[4:]
	sigchan := make(chan os.Signal, 1)
	signal.Notify(sigchan, syscall.SIGINT, syscall.SIGTERM)

	c, err := kafka.NewConsumer(&kafka.ConfigMap{
		"bootstrap.servers":  bootstrapServers,
		"group.id":           group,
		"session.timeout.ms": 6000,
		"auto.offset.reset":  "earliest"})

	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to create consumer: %s\n", err)
		os.Exit(1)
	}

	fmt.Printf("Created Consumer %v\n", c)

	client, err := schemaregistry.NewClient(schemaregistry.NewConfig(url))

	if err != nil {
		fmt.Printf("Failed to create schema registry client: %s\n", err)
		os.Exit(1)
	}

	deser, err := avro.NewSpecificDeserializer(client, serde.ValueSerde, avro.NewDeserializerConfig())

	if err != nil {
		fmt.Printf("Failed to create deserializer: %s\n", err)
		os.Exit(1)
	}

	err = c.SubscribeTopics(topics, nil)

	run := true

	for run {
		select {
		case sig := <-sigchan:
			fmt.Printf("Caught signal %v: terminating\n", sig)
			run = false
		default:
			ev := c.Poll(100)
			if ev == nil {
				continue
			}

			switch e := ev.(type) {
			case *kafka.Message:
				value := User{}
				err := deser.DeserializeInto(*e.TopicPartition.Topic, e.Value, &value)
				if err != nil {
					fmt.Printf("Failed to deserialize payload: %s\n", err)
				} else {
					fmt.Printf("%% Message on %s:\n%+v\n", e.TopicPartition, value)
				}
				if e.Headers != nil {
					fmt.Printf("%% Headers: %v\n", e.Headers)
				}
			case kafka.Error:
				// Errors should generally be considered
				// informational, the client will try to
				// automatically recover.
				fmt.Fprintf(os.Stderr, "%% Error: %v: %v\n", e.Code(), e)
			default:
				fmt.Printf("Ignored %v\n", e)
			}
		}
	}

	fmt.Printf("Closing consumer\n")
	c.Close()
}