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 val=0U;
    for(int i=0;i<31;i++)
    {
    uint32_t mask=1U;
        if(i%2==0)
        {
        mask<<=i;
        if((mask&=reg)!=0){
            mask>>=(i/2);
            val |= mask;
        }
        }
    }
    return val;
}

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

Solving Approach