Try without echo

src/freedombone-utils-onion

     onion_stealth_name="$4"
 
     if [[ $(onion_service_exists ${onion_service_name}) == "1" ]]; then
-        echo $(cat /var/lib/tor/hidden_service_${onion_service_name}/hostname)
+        cat /var/lib/tor/hidden_service_${onion_service_name}/hostname
         return
     fi