fixes #8673; Add operator's associativity check for stacks/infix_to_p…

[amirsoroush]

Fixes #8673

Describe your change:

I also added a doctest to reveal the problem.

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[Siddhesh-Agarwal]

Solves UP031

Lines 79 and 104 in ciphers/rsa_cipher.py can be changed to:

"ERROR: Block size is {block_size} bits and key size is {key_size} bits. The RSA cipher "

and line 82 and 107 can be changed to:

.format(block_size=block_size*8, key_size=key_size)

[rohan472000]

@amirsoroush you can run github actions again now, as your ruff failure issues has been fixed by my PR #8680, so, it shouldn't be fail this time.

[tianyizheng02]

@amirsoroush Could you put Fixes #8673 in your PR description? This PR isn't linked to the issue because GitHub is very particular about the formatting of closing keywords.

[tianyizheng02]

I've already fixed the ruff errors in #8913, so we can merge this once that PR gets merged

[amirsoroush]

@tianyizheng02 Do I need to push an empty commit for tests to be passed?

[tianyizheng02]

Once that other PR is merged, pulling the latest commits from the main branch should be enough

[tianyizheng02]

@amirsoroush The other PR has been merged so try updating your branch

[tianyizheng02]

Thanks for your contribution!