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;

    for (int i = 0; str[i] != '\0'; i++) 
    {
        result <<= 1;  // Shift left by 1
        if (str[i] == '1') 
        {
            result |= 1;  // Add 1 if current char is '1'
        } 
        else if (str[i] != '0') 
        {
            // Invalid character
            return 0xFFFF;  // Optional error handling
        }
    }
    return result;
}

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

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