Need to Remove Slash at the End of a Redirect

I need to add to this iRule so that it will remove the slash that might be placed at the end of the uri (Android version of the app is adding a slash and breaking the app. iOS version does not add slash and works fine).

when HTTP_REQUEST { if { [HTTP::uri] starts_with "/HELP/storage" } { set newpath [HTTP::host][string map {"/HELP/" "/"} [HTTP::uri]] HTTP::redirect "https://$newpath" } }