Extract and Modify Field in a 32-bit Register

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

uint32_t update_register(uint32_t reg) {
    uint8_t target_field = (uint8_t)((reg >> 10) & 0x1F);
    target_field += ((~target_field & 0x1F) + 0x1F) >> 5;
    reg &= ~(0x1F << 10);
    reg |= ((uint32_t)target_field << 10);
    return reg;
}

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