Unfold tree ...  ok.
Has key value 50 ?: N.
Inserting 50 
[ 47 [ 45 [ 16 [] [ 36 [ 32 [] [] ] [] ] ] [ 46 [] [] ] ] [ 97 [ 72 [ 50 [] [] ] [ 91 [] [] ] ] [] ] ]
Has a current item? Y.
Current item: 50
Search for key value 72 ...  found.
Has a current item? Y.
Current item: 72