Extract a Bit Field from a 32-bit Register

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

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    uint32_t extracted_reg = 0, j = 0;
    bool temp = 0;
    for (int i = pos; i<(pos+len); i++){
        //temp = reg & (1<<i);
        if (reg & (1<<i)){
            extracted_reg |= (1 << j);
        }
        j++;
    }
    return extracted_reg;
    
}

int main() {
    uint32_t reg;
    uint8_t pos, len;
    scanf("%u %hhu %hhu", &reg, &pos, &len);
    printf("%u", extract_field(reg, pos, len));
    return 0;
}