Arg.java:33: Arg should extends {@link org.cactoos.Scalar} #28
Description
The puzzle DEV-eb957d7b from #DEV has to be resolved:
The puzzle was created by @dgroup on 01-Mar-19.
If you have any technical questions, don't ask me, submit new tickets instead. The task will be "done" when the problem is fixed and the text of the puzzle is removed from the source code. Here is more about PDD and about me.