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
    uint16_t evenReg = 0;
    for(int i=0, j=0; i<32; i=i+2, j++) {
        if(reg & (1<<i))
            evenReg = evenReg | (1<<j);
    }
    return evenReg;
}

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