Extract Even Bits Only from 32-bit Register

Code

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

uint32_t extract_even_bits(uint32_t reg) {
    // Your code here
    int j =0 ;
    for( int i =0 ; i< 32 ; i=i+2){
        (reg & ( 1<<i))?(reg |= (1<<j++)):(reg &= ~(1<<j++));
    }
    while( j<32){
        reg &= ~(1<<j);j++;
    }
    return reg;
}

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

Solving Approach