using the code below provide the circuit design and system justification for a 4-story building elevator system

module Elevator(request_floor, in_current_floor, clk, reset, complete, direction, out_current_floor); //input pins input [3:0] request_floor; //4 bit input floor request input [3:0] in_current_floor; //4 bit input request floor; input clk; input reset; //1 bit input reset //output pins output [3:0] out_current_floor; //4 bit output showing current floor output direction; //1 bit output indicates if elevator is going up or down output complete; //1 bit output indicates if elevator is stopped or running //parameters set for register reg r_direction; //1 bit reg connected to direction reg r_complete; //1 bit connected to complete; reg [3:0] r_out_current_floor; //4 bit reg connected to out_current_floor  //register for clock generator reg [6:0] clk_count; reg clk_100; reg clk_trigger; //match pins and registers assign direction = r_direction; assign complete = r_complete; assign out_current_floor = r_out_current_floor; //starting up  always @ (negedge reset) //will only run when reset = 0, reset CLK_100, CLK_count, and CLK_trigger to 0     begin        clk_100 = 1'b0;    clk_count = 0;    clk_trigger = 1'b0;        //reset the clock registers    r_complete= 1'b0; end    //clock generator block always @ (posedge clk) begin        if (clk_trigger)         begin        clk_count = clk_count +1;    end    if (clk_count == 5000) begin        clk_100 =~ clk_100;        clk_count = 0;    end    end //floor the user requested always @ (request_floor)     begin        clk_trigger =1 ;    clk_100 =~ clk_100;     //generator for trigger clock        r_out_current_floor <= in_current_floor; end //different cases for elevator always @ (posedge clk) begin if (!reset)    begin        if (request_floor > r_out_current_floor) begin    r_direction = 1'b1;        r_out_current_floor <= r_out_current_floor << 1;    end        else if (request_floor < r_out_current_floor) begin    r_direction = 1'b0;    r_out_current_floor = r_out_current_floor >> 1;    end        else if (request_floor == r_out_current_floor) begin    r_complete = 1;    r_direction = 0;    end end end endmodule