Need to find previous position of rectangle in raylib(c++)

Question

I am trying to make a tron style game and I need a help finding the previous position of a rectangle(my player) and drawing over it another reactangle(the light trail).The code i wrote dose something like that but dose not work how i want it to. Te player starts at 400,400(x,y) and the previous x and y variables are initiated with 400.

int main()
{
    InitWindow(800, 800, "Tron");
    SetTargetFPS(10);
    int direction=0;

    while (!WindowShouldClose())
    {
        ClearBackground(BLACK);
        BeginDrawing();
        
        DrawRectangle(player1x, player1y, 18, 18, RED);

        EndDrawing();
        DrawRectangle(prevx, prevy, 18, 18, RED);
        if (IsKeyPressed(KEY_D))
        {
            direction = 1;
        }

        else if (IsKeyPressed(KEY_A))
        {
            direction = 2;
        }

        else if (IsKeyPressed(KEY_W))
        {
            direction = 3;
        }

        else if (IsKeyPressed(KEY_S))
        {
            direction = 4;
        }

        if (direction == 1) 
        {  
            player1x = player1x + 20; 
            prevx = player1x - 20;
        }
        else if (direction == 2) 
        { 
            prevx = player1x + 20;
            player1x = player1x - 20; 
        }
        else if (direction == 3) 
        {
            prevy = player1y + 20;
            player1y = player1y - 20; 
        }
        else if (direction == 4)
        {
            prevy = player1y - 20;
            player1y = player1y + 20;
        }
    }

    CloseWindow();

    return 0;
}