func aprintIfExists(n string, v []string, a bool) {
	if len(v) != 0 {
		fmt.Printf("----> %s: ", n)
		for i := range v {
			if !a && i == 10 {
				fmt.Printf("...")
				break
			}
			fmt.Printf("%s ", v[i])
		}
		fmt.Printf("\n")
	}
}
aprintIfExists prints pretty lines if the slice
is not empty
package main
import (
	"flag"
	"fmt"
	"os"
	"github.com/fern4lvarez/go-metainspector/metainspector"
)
func exit(msg string) {
	fmt.Println(msg)
	os.Exit(1)
}
func defaultURL() string {
	if len(os.Args) > 1 {
		if a := os.Args[1]; a == "--h" {
			return "www.example.com"
		}
		return os.Args[1]
	}
	return "www.example.com"
}
func sprintIfExists(n string, v string) {
	if v != "" {
		fmt.Printf("----> %s: %s\n", n, v)
	}
}