func (az *Cloud) isAvailabilityZone(zone string) bool {
	return strings.HasPrefix(zone, fmt.Sprintf("%s-", az.Location))
}
isAvailabilityZone returns true if the zone is in format of <region>-<zone-id>.
package azure
import (
	"context"
	"fmt"
	"os"
	"strconv"
	"strings"
	"k8s.io/apimachinery/pkg/types"
	cloudprovider "k8s.io/cloud-provider"
	"k8s.io/klog/v2"
	azcache "k8s.io/legacy-cloud-providers/azure/cache"
)
func (az *Cloud) makeZone(location string, zoneID int) string {
	return fmt.Sprintf("%s-%d", strings.ToLower(location), zoneID)
}