22. Extract Even Bits Only from 32-bit Register

#include <stdio.h>
#include <stdint.h>

uint32_t extract_even_bits(uint32_t reg) {
    uint16_t ret_val = 0;
    uint8_t pos = 0;
    for (int index = 0; index < 32 ; index += 2){ 
        ret_val |=(1 & (reg >> index)) << pos;
        pos++;   
    }
    return ret_val;
}

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