20. Clear Specific Bits in a 32-bit Register

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

uint32_t clear_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    const uint16_t end_bit = (uint16_t)pos + (uint16_t)len;// Prevent values mistakes

    if ((len == 0U) || (end_bit == 32U)){
        return reg;
    }

    uint64_t mask = (uint64_t)((1ULL << len) - 1ULL);// Prevent overflow
    
    reg &= ~( (uint32_t)mask << pos );
    return reg;
}

int main() {
    uint32_t reg;
    uint8_t pos, len;
    scanf("%u %hhu %hhu", &reg, &pos, &len);
    printf("%u", clear_bits(reg, pos, len));
    return 0;
}