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
    uint32_t mask = ((1<<5) -1);
    uint8_t extractval = (reg >> 10) & mask; //111111111
    if(extractval < 31)
    {
        extractval++;
        //update reg
        reg &=  (~(mask << 10));
        reg |= (extractval << 10); 
    }

    return reg;
}

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