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 ans = 0;
    for ( uint8_t i =0; i<16; i++ )
    {
        uint8_t bit = ((reg >> (2*i)) & 1u);
        ans |= bit << i;
    }
    return ans;
}

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