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<<14)-1);
    uint32_t res = ((reg >> 9) & mask);
    if(res == 30)
    {
        reg = (reg &(1<<14));
        reg = reg | (1<<14);
        return reg;
    }
    else if(res == 31)
        return reg;

    else if(res == 0)
    {
         res = (res | (1<<10));
        return res;
    }
    else if(res >31)
        return reg;
    else if(31 > res)
    {
        reg = reg<<1;
        return reg;

    }    
}

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