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 fill = 0;
    for (int i = 0; i < 32; i++) {
        if (!(i % 2)) {
            // Extract the bit
            uint32_t val = (reg >> i) & 1u;
            fill |= (val << (i / 2));
        }
    }
    return fill;
    
}

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