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
    uint32_t temp; 
    uint32_t mask; 
    uint32_t result; 
    for(int i = 0; i < 16; i++)
    {   temp = (1U & (reg >> (2*i)));
        mask = (1U << i);
        result |= (mask & temp << i);
    }
    return result;
}

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

Solving Approach