Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your co
    uint32_t a =0;
    int i=30;
    while(i>=0)
    {
        a <<= 1;
        a |= ((reg >> i) & 1);
        i-=2;
    }
    return a;
}

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

Solving Approach