Convert Binary String to Integer Without strtol function or Libraries

Code

#include <stdio.h>
#include <stdint.h>
#include <string.h>
uint16_t binary_to_uint(const char *str) {
    uint16_t res=0,n=strlen(str);
    for(int i=n-1;i>=0;i--){
        res+=((str[i]-'0')<<(n-i-1));
        //printf("%d ",a);
    }
    return res;
}

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

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

Solving Approach