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 mul=1;
    int n=strlen(str);
    int res=0;
    for(int i=n-1;i>=0;i--)
    {
        int temp=(str[i]-'0')*mul;
        res+=(temp);
        mul*=2;
    }
    return res;
}

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

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

Solving Approach