- Created a new testbench file `top_ultrasonic_led_tb.vvp` to simulate the functionality of the `top_ultrasonic_led` module.
- Included necessary signal definitions and event triggers for clock, reset, start, echo, and trigger signals.
- Implemented a state machine to handle the ultrasonic measurement process and LED display logic.
- Added simulation parameters for distance measurement and LED control.
- Integrated VPI calls for waveform dumping and simulation control.
