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
    // Handle zero-length case immediately
    if (len == 0) return 0;
    
    // Create mask with 'len' consecutive 1s
    uint32_t mask = (0xFFFFFFFF >> (32 - len));
    
    // Shift register to align target bits at LSB
    // Apply mask to isolate the bits
    return (reg >> pos) & mask;
}

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;
}