22. Extract Even Bits Only from 32-bit Register

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    uint32_t working_reg = 0;
    for (int index = 32; index > 0; index-=2) {
        working_reg = working_reg << 1;
        working_reg += (reg & (1 << (index-2))) ? 0b1:0b0;
    }
    return working_reg;
}

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