AVR Freaks

hi guys I am new to AVR world I wanted to know what is the wrong with my code there are no errors in my code but in proteus simulator its still working on 100% speed or full duty cycle any advice?

#include <avr/io.h>
#include <avr/interrupt.h>

void Timer0_PWM(unsigned char duty_cycle){

	TCNT0=0;

	OCR0=duty_cycle;

	DDRD |= (1<<3);

	TCCR0 = (1<<WGM00) | (1<<WGM01) | (1<<COM01) | (1<<CS01);

}
int main (void)
{
	Timer0_PWM(64);

	DDRA &= ~(1<<0);
	DDRA &= ~(1<<1);
	DDRA &= ~(1<<2);

	DDRC |= (1<<0);
	DDRC |= (1<<1);

	PORTC &= ~(1<<0);
	PORTC &= ~(1<<1);



	while (1)
	{
		if (PINA & (1<<0))
		{
			PORTC |= (1<<0);
			PORTC &= ~(1<<1);

		}
		else if (PINA & (1<<1))
		{
			PORTC &= ~(1<<0);
			PORTC |= (1<<1);
		}
		else if (PINA & (1<<2))
		{
			PORTC &= ~(1<<0);
			PORTC &= ~(1<<1);
		}

	}
}