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) {
    // Your logic here
    int base = 1,i = 0,d,res = 0,l = strlen(str);
    for(i = l-1;i>=0;i--)
    {
        d = str[i] - '0';
        res = res + d*base;
        base*=2;
        //i++;
    }
    return res;
}

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

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

Solving Approach