Awful kata requiring mind-boggling special casing until you hit the right 'spot', due to its poor description and dubious interpretations.

ballTest(5, 'xxxxx')); being true bothers me; I think it should be false.
Spec says
'return whether or not the ball will be able to make it past the end of the road'
'The ball must fall off of the edge of the road for the code to be considered valid.'
The speed at the end of the road is -1, the ball is stuck on the 5th crack, never to make it past the end of the road.

Terrible details.

You're correct thank you for the feedback! The description has been changed

The last tile has index roadmap.length - 1 though (as strings are zero-indexed), so if the position is roadmap.length, the ball will already have passed the final tile.

I am not sure I understand completely what you are trying to say but I will attempt to explain. In your snippet, the program is checking (currentPosition >= roadmap.length) which does not imply that the ball has passed the final tile. It only means that it has reached the final tile. To check if it has passed, you must check (currentPosition > roadmap.length) instead. So the correct solution would use the example shown, meaning that the ball did not necessarily pass the final tile, but may have only reached it instead.

approved by author

#include <stdbool.h> is missing in the initial code

Точно... Скорость уменьшается - пропорционально уменьшается пройденное расстояние.

C Translation

If the range is 62 and the speed is 10 and the ball can only travel 10+9+8...+1 then the ball will only end up traveling 55 units before the speed is 0

test.assert_equals(ball_test(10, '______________________________________________________________'), False)

Velocity equal 10
Range equal 62
Speed decrease 6
Remaining speed 4
Why result in 7 Test is False?

not working all, but code is corect

JS Translation waiting for approval :)