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 val = 0;
    for(uint8_t index = 0, index2 = 0 ; index < 31; index += 2, index2++)
    {
        if(0 < (reg & (1 << index)))
        {
            val |= (0x01 << index2);  
        }
    }
    return val;
}

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