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

    return res;
}

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

Solving Approach