Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    int pos=0,i,result;
    for(i=0;i<32;i+=2)
    {
        if(reg & (1<<i))
        {
            result |=(1u<<pos);
            
        }
        pos++;
    }
    return result;
}

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

Solving Approach