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
    volatile char i, idx = 0;
    uint32_t ans = 0;
    
    for(i=0;i<32;i=i+2){
        if(reg & (1<<i)){
            ans |= (1<<idx);
        }
        idx++;
    }
    return ans;
    
    
}

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

Solving Approach