24. Open-Source Line using tri0

tri0 makes it default to 0 when released (confused), hence when drive_high is high, the line is also high but when drive_high is low (0), line becomes high impedance, releases, and hence defaults to 0 as per tri0.

/*Write your code here*/
module open_source_line (
    input drive_high,
    output tri0 line
);
    assign line = drive_high? 1'b1: 1'bz;
endmodule