Blink leds in many patterns (EMBEDDED)

I would like to blink leds in many patterns. I wanna ask if my code is a "programmer solution". I create an incrementing variable named "counter" and switch LED state if counter reach some value. I am not sure about using equal operator in if condition like if(counter == 20). How to avoid jumping into LED switching part every counter increment another way?

Can someone rewrite this program into "shape"?

Another solution is to change a timer value to next overflow, is it better?

if(timer_10ms_flag ==  1) {
  timer_10ms_flag ==  0;

  if((counter > 100) || (reset_counter == 1)) {
    counter = 0;
    reset_counter = 0;
  }

  if(mode == 0) {
    if(counter == 0) {
      LED_ON;    
    }

    if(counter == 20) {
      LED_OFF;
    }
  }

  if(mode == 1) {
    if(counter == 0) {
      LED_ON;    
    }

    if(counter == 10) {
      LED_OFF;
    }

    if(counter == 20) {
      LED_ON;    
    }

    if(counter == 40) {
      LED_OFF;
    }
  }

  counter++;
}