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 uncompressed = reg & 0b01010101010101010101010101010101;
    // extract only the even bits;
    uint32_t compressed = 0U;
    uint8_t i=0;
    while(i<32){
        compressed |= (1U&uncompressed)<<i;
        uncompressed >>=2;
        i++;    
    }
    
    return compressed;
}

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