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 bit = 0;
    for(int i=0; i<16; i++){
        uint32_t mask = ((reg>>(2*i))&0x01);
        bit |= (mask<<i);
    }
    return bit;
}

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