22. Extract Even Bits Only from 32-bit Register

#include <stdio.h>
#include <stdint.h>

uint32_t extract_even_bits(uint32_t reg) 
{
    // Your code here
    uint8_t bit_idx=0;
    uint32_t res = 0;
    while(bit_idx<32)
    {
        if((bit_idx%2)==0)
        {
            res |= ((reg>>bit_idx)&(0x01))<<(bit_idx/2);
        }
        bit_idx++;
    }

    return res;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    printf("%u", extract_even_bits(reg));
    return 0;
}