can you provide a test case that this solution would fail ? ;-)

Random tests are needed (at least in C). This solution shouldn't have been accepted: https://www.codewars.com/kata/reviews/633ecc4a0b4d8d0001547ed6/groups/633ecc4b0b4d8d0001547edb

yes if a large para is given as input.
but the coder's mind is next level.🫡

For example, if your string contains both 1 and 0, and you replace 1 with I, that might create a situation where another part of the string (e.g., something containing 10) is now altered in an unexpected way when 0 is replaced with O.

10 points for niceness!

i didn't know that range function return a list . nice

What does unstable mean in this context?

That's nice one

very good

It looks realy cool...

It works perfectly for everyone. Not sure where you're getting an error.

Once it becomes very large, this is highly inefficient. At the very minimum try to at least cut the data to where only the useful info is