random test are broken.
Every time:"There should be 0 solutions in this list of words. - Expected: 0, instead got: 'my_answer'".
But [words] has sets of words like [call,cell,cill,coll,cull] and other.

Resolved. (it's necessary to fix random tests)
If i change incoming array words(at the end length = 0), then i get 'Expected: 0' and random test are incorrect.
I have to make a copy of an incoming array.