Convert Binary String to Integer Without strtol function or Libraries

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

uint16_t binary_to_uint(const char *str) {
    // Your logic here
    uint16_t result =0;
    while(*str!='\0')
    {
        result <<= 1;
        result |= (uint16_t)(*str-48);        
        // printf("*str=%c result=%d \n",*str,result);        
        str++;
    }
    return result;
}

int main() {
    char bin[20];
    scanf("%s", bin);

    printf("%u", binary_to_uint(bin));
    return 0;
}