Question: write a verilog code for a 4 bit adder and subtractor . (use HA, FA, & XOR gates ,indicate the presence of a carry overflow).

write a verilog code for a 4 bit adder and subtractor . (use HA, FA, & XOR gates ,indicate the presence of a carry overflow). + testbench

Note: i need both of adder and subtractor in same code together + testbench

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