Another programming language is not a valid point, because different languages are done with translations, and not by creating new but similar challenges.

Description seems to be not a valid point either, because description can be updated. If you think that the description of the currently existing task is wrong, you can raise an issue and explain the problem.

So basically the only remaining point is the additional condition in the other challenge, which is not present in your challenge. Now the question would be, how different does it make your challenge from the other one? Are they very similar? How are solutions different? Do they differ more significantly than just one additional if, or some small block? If some user solves your challenge first, and the other challenge later, will they feel that they just solved the same problem twice? This would be the most relevant factor to decide whether your challenge is a (close) duplocate or not.

yes, I agree that the essence of the task is the same, but that task is not described according to the rules of Codewars, and there is also an additional condition that I do not have, + the task is in another programming language

Already fixed in this fork

Modified description to have :

Not all strings will contain digits and not all inputs will be string. In those cases, return -1.

Should be clear now.

I merged a fix, can you please verify.

fork

Fork that updates the random tests.

Already approved, resolving.

The reason I did not include these in C# is to be forward compatible with future language versions. Unlike contextual keywords, it is unlikely new keywords will de added to the language.

you are righ, same as in the original, probably ypou might want to report the issue

how long did it take to reach your rank and do you code professionally

I've done all changes. Thanks for your feedback.

Fixed in this fork

done