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
    int num =0;
    int i =0;
    int len=0;
    while(str[i] != 0){
        num = (str[i] - '0')  + num * 2;
        len++;
        i++;
    }
    len = len -1;

    return num;
}

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

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

Solving Approach