Your question is HDL Pulse Counting Module. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a module using any HDL that detects 10 pulses within 100 cycles, starting a new 100-cycle window from each received pulse so you can detect the 10th pulse before the window ends.