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 i=0;
    int res = 0;
    while (*str != '\0'){
        if (*str == '1') {
            res += 1;
        }
        res<<=1;
        i++;
        str++;
    }
    return res>>1;
}

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

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

Solving Approach