feat:#5 added free rooms api endpoint

backend/service/functions/string.go

@@ -45,3 +45,9 @@ func HashString(s string) string {
 	hashInBytes := hash.Sum(nil)
 	return hex.EncodeToString(hashInBytes)
 }
+
+func SeperateRoomString(rooms string) []string {
+	return strings.FieldsFunc(rooms, IsSeparator(
+		[]rune{',', '\t', '\n', '\r', ';', ' ', '\u00A0'}),
+	)
+}