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
    int num=0,mul=1;
    for(int pos=0;pos<=31;pos=pos+2,mul=mul*2)
    {
        if((reg>>pos&1)==1)
        num=num+mul;
    }
    reg=num;
    return reg;
}

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

Solving Approach