Tennibot interview questions

one skype interview: talked about projects, asked basic ROS questions. Showed a piece of a node cpp code, and asked to explain it. Finally was asked to design a decision tree for a mini version of tennibot as take away submission. Sent it within the day, got ghosted

it was an easy interview via skype. I got invite days back, but after the interview got ghosted (no reply regarding the interview result). In general the questions were not difficult, the interviewer was quite proficient about ROS