random tests fail. I don't understand I return exacly the message required by ID. and yet expected is som erandomly chosen value? can you descrive what you expect in random tests? tacked my brain for half a day already. thanks. adding this to description would also help.

what is incorrect? can you elaborate?

this is not a BST problem. it is a general BT problem. why put a misleading title?

this kata is not for 7 kyu. I spend couple of days just digging into prime numbers theory to find a suitable alogorithm. compared to other 7 kyu kata this was hard! it is 6 kyu may be?

I've got an error for randoms tests. My program genrally works only gets stuck on 3 random tests. Passed: 97Failed: 3Exit Code: 1

And I can't figure what are the random tests consist of? Is age of sons different? Or it could be same?

//It should work for random tests too - Expected: ''I need to buy a bicycle for my second son.'', instead got: ''I need to buy a bicycle for my third son.''//