Write a VHDL code for a one-digit BCD adder/subtractor using Quartus- 10 points Il design software. Submit the block and circuit diagrams, print-outs of the code, its compilation report and simulation results. AddSub Carryin X OS Y Overflow Carryout Schematic of BCD adder/subtractor module Design a counter for the KL shopping mall entrances to allow maximum 99 shoppers at a time to promote social distancing. [Hints: Reset button can be used to clear the counter every morning; in/out signal can be used to control the up/down counter while people are moving in and out; red-light can be used to indicate whether they are allowed to enter] The format of your project report should be as followed: 1. Introduction (brief explanation of your project/purpose) 2. Methodology Flowchart/block diagram of the entire system Explanation of top module I/O ports Schematic of the entire design (top module with interconnected inner module) 3. Result/Discussion Top module compilation report (screenshot table) Top module RTL (screenshot n explain) Simulation results (screenshot n highlight critical points) 4. Conclusion (very brief) 5. References (if necessary)