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
    unsigned int val = 0;
    int counter = 0;
    for(int i = 0; i < 32; i++)
    {
        if( i % 2 == 0 && (reg & (1 << i)))
        {
            val |= (1 << counter);
            counter++;
        }
    }
    return val;
}

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