Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    int i,j=0;
    uint32_t bit;
    uint32_t res=0;
    for(i=0;i<16;i++){
        bit=reg>>(i*2)&1;
        res|=(bit<<j);
        j++;


    }
    return res;
}

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

Solving Approach