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 = 0;
    for (uint8_t i = 0; i<16;i++)
    {
        retVal |= ((reg >> 2 * i) & 0x1u) << i;
    }
    return retVal;
}

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