using System.Collections.Generic can be removed from here ;) Is useless

if you need to be proffesional dont use the functions that aleardy defined in programming language

this solution is amazing man, thank you

Nice but, what happened with "!", in the example it was at final of the word...

I've tried to take a clean code approach as well, would be curious for peoples feedback on that

funny, I wrote exactly the same code

hooo , this solution was writed for a ninja.
i have to learn very much

It also doesn't work if the string starts or ends with a space.

I dont like codes like this, its not unterstandable what you have done

code readability is the key in programming!

If the sentence has multiple spaces, removing the empty entries would cause the output to have fewer spaces than necessary.

Otherwise, yes.