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 reg_2 = 0;
    for (int i = 0; i < 32; i += 2) {
        reg_2 <<= 1; // Shift first
        reg_2 |= (reg >> (30 - i)) & 1; // Extract from MSB down
    }
    return reg_2;
}


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