Refactor box libfuncs to use the BlockExt trait

[edg-l]

See: #518

Refactor the code implementing the libfuncs to use the trait methods from BlockExt.

[Gerson2102]

Pls assign this to me, in case is not possible to refactor bitwise. Since the functions that can be refactored according to the PR that is related to the BlockExt trait, they are not in bitwise.

[FeliGR]

Hello @edg-l,

I noticed that @gerson initially asked about this issue. I've reviewed the details and understand the task. If he chooses not to pursue it further, I would be interested in working on this. Could you kindly assign it to me if it becomes available?

[Gerson2102]

Pls assign this to @FeliGR

[vibenedict]

i will like to jump on it