Extract Even Bits Only from 32-bit Register

Code

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

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

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

Solving Approach