need help with the block diagram and many the truth table don't need help with k-map and simplify

Question (3): (answers should be in detail, showing all steps) - Design a Binary Coded Decimal (BCD) to Excess-3 converter circuit. Your design should include the high level diagram of the converter, the full truth table, and the most simplified expression of each output signal using the k-maps technique. Feel free to assume that any invalid inputs are filtered