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 acc = 0;
    acc |= reg & 1;
    for (int i = 1; i < 17; ++i){
        reg >>= 2;
        acc |= ((reg & 1U)<<i);
        
    };
    return acc;
}

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