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 res=0;
    int i=0;
    if(str[i]==0) printf("0");
    while(str[i]!='\0'){
        res=((res<<1) | (str[i] - '0'));
        i++;
    }
    return res;
}

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

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

Solving Approach