Convert Binary String to Integer Without strtol function or Libraries

Code

#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;
        if(str[i] == '1'){
            result |= 1;
        }
        else if(str[i] != '0'){
            return 0xFFFF;
        }
    }
    return result;
}

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

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

Solving Approach