How do I resolve this in c++?

Question

I need help, I'm doing a tick-toe game in c++ but I get a yellow error ( No return, in función returning non-void) in char hayGanador

Please, help.
https://code.sololearn.com/coJd2CsO2HSV/?ref=app

Answer 1

Post the code and let me see

Answer 2

https://code.sololearn.com/coJd2CsO2HSV/?ref=app