Removing null from uncomplete command

i wanted to add the command !multi$(1)/$(2)/$(3)
if we try to command “”!multi user user " and leave the third argument empty, it will turn into !multi
how can we remove the null? and leave it blank?

This command will accept any number of channels and will remove @ from channel names in case you use that character to mention a channel.

!editcom !multi $(eval s=decodeURIComponent("$(querystring)").replace(/@/g,"").split(" ").filter(c=>c.length).map(c=>encodeURIComponent(c));s.length?""+s.join("/"):"No channels")

that works perfectly… thanks

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