because it contains a space at the end.

pen and paper really helped me thnx

first of all .. i am relly happy that i am getting repl,ies

Even though you say there is "no loop", you need to understand that your sum() isn't magic - it is doing essentially the exact same thing as a loop; it is performing all of those (many) area calculations inside the () and then summing them.

If I tell you, for example, "add all the areas in the board" and "for each area in the board, add it to the total" - are these 2 fundamentally different algorithms? No! The 2nd command obviously has a "for loop" in its syntax, but the 1st command has the exact same calculations also!

If you're struggling still, forget about coding/loops/etc and go back to basics - try to solve this away from your computer, as if it were a puzzle on paper.

with no loop also kata is timed out :(

with no loop also this kata is timed out :(

Thank you, my bad i should have seen the tests down there.

Don't include main function in your code. The tests call your function is_valid_ip and check the value it returns.

Oh, I'm using C.
It's what I said, when i try to test or attempt the tests are always a "Log". Then even if the answear is 1 or 0 it's always wrong.

Please say which language you're using and give more concrete elements, it's hard to help otherwise. You should read this: https://docs.codewars.com/training/troubleshooting/

So when I try to attempt or test it appear that log is a valid option i guess, idk waht this means.

Read some of the many posts below asking the same.

why this IP is invalid 1.2.3.4

It's possible you are not allowed to put a spoiler flag afterward, included on your own message, until you did earn a certain amount of honor points, I don't remember. Don't worry, it's not big issue. Just try to remember it before publishing next time until you have this privilege :)