This comment is hidden because it contains spoiler information about the solution
Yes it is. You renamed the function. Change it back to that. Not a kata issue, use Question label next time.
In file included from main.cpp:7: ./tests.cpp:5:19: error: use of undeclared identifier 'digital_root' Assert::That(digital_root(16), Equals(7));
is it my fault?
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This comment is hidden because it contains spoiler information about the solution
Yes it is. You renamed the function. Change it back to that. Not a kata issue, use Question label next time.
In file included from main.cpp:7:
./tests.cpp:5:19: error: use of undeclared identifier 'digital_root'
Assert::That(digital_root(16), Equals(7));