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