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
    uint32_t output_count = 0;
    for(int i=0;i<32;i++){
        if (reg & (1<<i) && i%2==0){
            output_count++;
        }
    }
    return (1<<output)-1; //Create a compressed mask of output count
}

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