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 new_reg = 0;
    int j = 0; 
    for(int i=0; i<32; i+=2){
        if((reg>>i) & 1){
            new_reg |= (1<<j);
        }
        j++;
    }
    return new_reg;
}

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