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 mask = 0; 
    int j = 0; 

    for(int i = 0; i < 32; i+=2){
        uint32_t bit = (reg >> i) & 1u; 
        mask = mask | (bit << j);
        j++; 
    }
    return mask; 
}

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