$($i$)$ Design a $7-$segment LED driver to show hexadecimal letters A$-$F inside a hierarchical block. Assume only letters will be sent to your block $($ignore the numbers$).$ Explain your design. Name your block with your student number: e$.$g$.123456$ LED driver$.($ii$)$ Test your circuit in block form using digital interactive constants to represent the inputs and show what the LED display shows for every input combination. Explain your testing.

use any $7$ digit for the number