Extract and Modify Field in a 32-bit Register

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

uint32_t update_register(uint32_t reg) {
    // Your logic here
    //create mask
    uint8_t pos = 10, bit = 5;
    uint32_t mask = (1<<bit)-1 << pos;
    uint32_t field = (reg >> pos) & 0x1F;
    if (field < 31){
        field++;
    }
    //clear field
    reg = reg & ~mask;
    reg = reg | (field<<pos);

    return reg;
}

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