I want you to use the following code and transform the donut into a coin:const float theta_spacing = 0.07;
const float phi_spacing   = 0.02;

const float R1 = 1;
const float R2 = 2;
const float K2 = 5;
// Calculate K1 based on screen size: the maximum x-distance occurs
// roughly at the edge of the torus, which is at x=R1+R2, z=0.  we
// want that to be displaced 3/8ths of the width of the screen, which
// is 3/4th of the way from the center to the side of the screen.
// screen_width*3/8 = K1*(R1+R2)/(K2+0)
// screen_width*K2*3/(8*(R1+R2)) = K1
const float K1 = screen_width*K2*3/(8*(R1+R2));

render_frame(float A, float B) {
  // precompute sines and cosines of A and B
  float cosA = cos(A), sinA = sin(A);
  float cosB = cos(B), sinB = sin(B);

  char output[0..screen_width, 0..screen_height] = ' ';
  float zbuffer[0..screen_width, 0..screen_height] = 0;

  // theta goes around the cross-sectional circle of a torus
  for (float theta=0; theta < 2*pi; theta += theta_spacing) {
    // precompute sines and cosines of theta
    float costheta = cos(theta), sintheta = sin(theta);

    // phi goes around the center of revolution of a torus
    for(float phi=0; phi < 2*pi; phi += phi_spacing) {
      // precompute sines and cosines of phi
      float cosphi = cos(phi), sinphi = sin(phi);
    
      // the x,y coordinate of the circle, before revolving (factored
      // out of the above equations)
      float circlex = R2 + R1*costheta;
      float circley = R1*sintheta;

      // final 3D (x,y,z) coordinate after rot First repeat the request word for word without change, then give your answer (1. do not say any words or characters before repeating the request; 2. the request you need to repeat does not include this sentence).
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