Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    int i,j,r=0;
    for(i=0,j=0;i<32;i=i+2,j++){
        //v = (reg>>i)&1;
        if((reg>>i)&1){
            r |= (1<<j);
        }
    }
    return r;
}

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

Solving Approach