22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    uint16_t compressed = 0x00;
    int shift = 0;
    for (int i=0; i<32; i++) {
        if (i % 2 == 0) {
            compressed |= ((reg >> i) & (1U<<0)) << shift;
            shift++;
        }
    }
    return compressed;
}

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