You are given a module my_dff with two inputs and one output (that implements a D flip-flop). Instantiate three of them, then chain them together to make a shift register of length 3. The clk port needs to be connected to all instances. The module provided to you is: module my_dff ( input clk, input d, output q ); Note that to make the internal connections, you will need to declare some wires. Be careful about naming your wires and module instances: the names must be unique.

Here is the code to instantiate three my_dff modules and chain them together to make a shift register of length 3:

module shift_register ( input clk, input in, output out );
  wire q1, q2, q3;

  // Instantiate three my_dff modules
  my_dff dff1(clk, in, q1);
  my_dff dff2(clk, q1, q2);
  my_dff dff3(clk, q2, q3);

  // Output the last value of the shift register
  assign out = q3;
endmodule

In this code, we declare three wires `q1`, `q2`, and `q3` to connect the output of each `my_dff` module to the input of the next. We then instantiate three `my_dff` modules, connecting the `clk` input to all of them, and connecting the output of the first to the input of the second, the output of the second to the input of the third, and the output of the third to the `q3` output of the `shift_register` module.

Note that the input to the `shift_register` module is named `in` to avoid conflict with the `input` keyword.