code: def find_distance(color1, color2)
        delta_r = color1[0] - color2[0];
        delta_g = color1[1] - color2[1];
        delta_b = color1[2] - color2[2];
        delta_r * delta_r + delta_g * delta_g + delta_b * delta_b
      end
docs: Helprt method