Yes, too many ways to explain from the hints

Yes, without preload codes, it is hard to understand how the whole codes works, especilly for the requirement that why users codes should end with `. Maybe we can show preload codes in descriptions.

@JohanWiltink Really sorry for my incorrect editing and hope you can revert them. I searched a lot but didn't find clear documents about how to update a kata. And even after @Blind4Basics replied to me in another kata, I still didn't get the right steps.

It is strange that allowing anyone to click the edit button. Why does codewars design like this, instead of like Github? And where are buttons similar to "fork" and "send pull request"? Tutorials with screenshots will be great.

Once again, my last time to make kata broken. Apologize for the inconvenience.

I edited as this issue says, which means adding an. But the last line, Function.__$$__safe__, is not changed by me.

In fact, I didn't find documents about how to update/fix katas. I clicked Edit, and Repubish. If forfeited by mistakes, it is sad. :(

2-[2-[1-methyl]ethyl-4-hydroxy-1-[1-hydroxy]methyl]butylpropdial

Should the last part be propandial, instead of without an?

15-[1,2,2-triamino]propenanoyloxy

According to test descriptions, 3 amino [NH2, here] at 1,2,3, positions must be wrong.

And it looks strange to me as it contains both en and an. Maybe the correct string should be 15-[1,2,3-triamino]propenoyloxy.

But it still violates bond validity. See the first C of the R.

       O
      ||
C15-O-C=C-C

This kata reminds me the high school days. But compared with Chinese, it is much harder to parse in English.

try

I solved it! So easy!! Why does it cost me for 4 months!!!
I begin to doubt my English reading skills deeply.

Right! I have to admit that is not exactly COPY.

But it is due to floating point precision as you mentioned, instead of algorithm thinking.

Please forgive me. It's not a kind of parade. Just want to know what the best solution is.

I only use a very straightforward one without any optimizations, and you know, reading other person's solutions is hard to understand.