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 retVal = 0x00000000U;

    for (uint8_t i = 0; i < 32; i += 2) {
        retVal <<= 1;
        retVal |= (reg >> (30 - i)) & 0x01U;
    }

    return retVal;
}

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