Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    uint32_t ans  = 0;
    for(int i =0; i<32; i+=2){
        uint32_t mask =1<<i;
        int temp = reg & mask ;
        if(temp){
            ans |= (1<<(i>>1));
        }
    }
    return ans;
}

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

Solving Approach