Yes PetrSr you are right I have added these examples, thanks

no problem, good luck)

hey jeroenpol, can you write your answer like it
{
index: 13,
addedText: "sass",
deletedText: "a"
}

Hey yuhaocooper, thanks for your message, if we add 'v' in 14 position and remove one space we will get:
'vvvvvvv vvvvvvvvvvvvv'
but we need to have
'vvvvvvv vvvvvvvvvvv'

with pleasure)

thank you for your help JohanWiltink

i have resolved issue with random tests and moved to Node 10

agree, thank you, i solved previous issues, can you close issue?

sure

thanks i will do this

done, thanks

the solution setup is wrong ? where is?

Which markup i have to fix?
I have removed middle block from examples.

I don't know how I can thank you, but you helped me a lot, I took your advice into account and changed this, if you have time, please check again)