22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) 
{
    uint32_t result = 0;
    result |= (reg&1);
    int leftshift = 1;
    uint8_t bit = 0;
    for(int i=2;i<32;i+=2)
    {
      bit = ((reg>>i)&(1));
      result = result |(bit<<leftshift);
      leftshift++;
    }
    return result;
}

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