[UnusedVariable] The field 'stack' is never read.

[UnusedMethod] Method 'item' is never used.

[UnusedVariable] The local variable 'storage' is never read.

[UnnecessaryLambda] Returning a lambda from a helper method or saving it in a constant is unnecessary; prefer to implement the functional interface method directly and use a method reference instead.

[UnusedVariable] The field 'lastPlayer' is never read.