Extract Even Bits Only from 32-bit Register

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

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

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

Solving Approach