Thank you so much man, I was struggling very hard here and you saved me.

His NickName pretty much covers it XD XD XD

OMG... I really need more than 2 hours to finish this one.

Well, compared to other katas of the same level, it was quite easy.
Took some time to figure out where I was wrong though.

Ok, before submitting I wanted to give you guys a hint you might struggle to figure out:
if the input string is Null oe Empty, it should return true.
Also it is worth specifying this information in the description.

Well, just finished the kata and I've never felt more relieved
Guys who just start and are not so experienced in programming, I wish you good luck
and big patience, you're gonna need it.

It took me about 2 hours to build the initial program and as much us 13 or 14 hours to figure out
where I was wrong.

Great kata, I think I've just got a skill point for my endurance

Thank you!

You can see the inputs just be printing them to the console ... .WriteLine(...) iirc in C#
for instance: "(C5H5)Fe(CO)2CH3"

You can check the formula yourself: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#how-can-i-see-which-input-causes-my-solution-to-fail

Figured out what the problem was, thank you guys for the answers!
Question resolved.

You can check the edge cases yourself: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#how-can-i-see-which-input-causes-my-solution-to-fail

I don't know which language you're trying but printing the input would help: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#print-input
And you can check the expected results are ok in some page like: https://www.wolframalpha.com/

Thank you

The input is a string of only digits

There are no points, so there are no floating-point numbers afaik