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
    unsigned char shift = 0;
    unsigned char mask = 0;
    unsigned char result = 0;

    shift = reg >> pos;
    mask = ((1 << len) - 1);
    result = shift & mask;

    return result;
}

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;
}