22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    uint32_t mask = 0;
    for( int i = 0; i < 16 ; i++ ){
       uint32_t bit = ( reg >> (i*2 ) ) & 1;
       mask |= ( bit << i);
    }
    return mask;
}

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