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 returnReg = 0;

    int j = 0;
    for(int i = 0; i<31; i+=2){
        returnReg |= ((reg&(1<<i))>>i)<<j;
        j++;
    }
    
    return returnReg;
}

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