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 x = 0; 
    for(uint8_t i=0; i<16; i++){
        x =  x | (((reg>>(2*i)) & 0x1) << i); 
    }
    return x; 
}

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