refactor: remove back and exit options from custom

main.go

@@ -69,15 +69,14 @@ func full(servers []string) {
 }
 
 func custom(servers []string) {
-selection:
 	file := ""
 	result := []string{}
 	prompt := &survey.MultiSelect{
 		Message: "Select CDN(s):",
-		Options: []string{"Back", "ArenaNet", "Blizzard", "Battle State Games", "City of Heroes", "Daybreak Games",
+		Options: []string{"ArenaNet", "Blizzard", "Battle State Games", "City of Heroes", "Daybreak Games",
 			"Epic Games", "Frontier", "Neverwinter", "Nexus Mods", "Nintendo", "Origin", "Path of Exile",
 			"RenegadeX", "Riot Games", "Rockstar Games", "Sony", "SQUARE ENIX", "Steam", "The Elder Scrolls Online",
-			"UPlay", "Warframe", "WARGAMING", "Windows Updates", "Xbox Live", "Exit"},
+			"UPlay", "Warframe", "WARGAMING", "Windows Updates", "Xbox Live"},
 		PageSize: 20,
 	}
 
@@ -87,24 +86,15 @@ selection:
 		return
 	}
 
-	switch {
-	case isStringInSlice("Back", result):
-		main()
-	case isStringInSlice("Exit", result):
-		os.Exit(0)
-	default:
-		for _, cdn := range result {
-			for _, cdns := range CDNs {
-				if cdn == cdns.Name {
-					file = cdns.File
-					hostnames := parseCDN(cdn, file)
-					lookupHostnames("", hostnames, 1, servers)
-				} else {
-					continue
-				}
+	for _, cdn := range result {
+		for _, cdns := range CDNs {
+			if cdn == cdns.Name {
+				file = cdns.File
+				hostnames := parseCDN(cdn, file)
+				lookupHostnames("", hostnames, 1, servers)
+			} else {
+				continue
 			}
 		}
 	}
-
-	goto selection
 }

utils.go

@@ -232,16 +232,6 @@ func isLookupInSliceEqual(a []Lookup, multihost bool) []Lookup {
 	return l
 }
 
-func isStringInSlice(needle string, haystack []string) (inSlice bool) {
-	for _, b := range haystack {
-		if b == needle {
-			return true
-		}
-	}
-
-	return false
-}
-
 func URLToLines(url string) ([]string, error) {
 	resp, err := http.Get(url)
 	if err != nil {