Clear Specific Bits in a 32-bit Register

Code

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

uint32_t clear_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    if((len==0||(len+pos)>32)) return 0;
    uint8_t n = 0; 
    for(uint32_t i=0;i<=32;i++){
        if(i==pos && n<len){
            reg&=~(1u<<i);
            pos++;
            n++;
        }
    }
    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;
}

Solving Approach