print all tags and value of the running EC2 instance from the inside (golang)

list all tags and value for EC2

package main

import (
        "fmt"
        "strings"

        "github.com/aws/aws-sdk-go/aws"
        "github.com/aws/aws-sdk-go/aws/session"
        "github.com/aws/aws-sdk-go/service/ec2"
        "github.com/aws/aws-sdk-go/aws/ec2metadata"
)

func RegionInstanceId() (region string, instanceID string) {
        c := ec2metadata.New(session.New())
        ec2InstanceIdentifyDocument, _ := c.GetInstanceIdentityDocument()
        region     = ec2InstanceIdentifyDocument.Region
        instanceID = ec2InstanceIdentifyDocument.InstanceID
        //fmt.Println(instanceID)
        return
}

func GetNameTag(name string) (value string, err error) {

        region, instanceID := RegionInstanceId()

        svc := ec2.New(session.New(&aws.Config{Region: aws.String(region)}))

        params := &ec2.DescribeInstancesInput{
                InstanceIds: []*string{
                        aws.String(instanceID),
                },
        }

        resp, err := svc.DescribeInstances(params)
        if err != nil {
                fmt.Printf("%s", err)
                return "", err
        }
        if len(resp.Reservations) == 0 {
                return "", err
        }
        for idx := range resp.Reservations {
                for _, inst := range resp.Reservations[idx].Instances {
                        for _, tag := range inst.Tags {
                                if (name != "") && (*tag.Key == name) {
                                        //fmt.Println(*tag.Key, "=", *tag.Value)
                                        return *tag.Value, nil
                                }
                        }
                }
        }
        return
}


func main() {
        var  name string

        flag.StringVar(&name, "name", "", "Which tag will output instead of all tags")
        flag.Parse()
        value, err := GetNameTag(name)

        if err != nil {
                log.Println(err)
                return
        }
        fmt.Println(value)
}

code refactoring