Convert Binary String to Integer Without strtol function or Libraries

Code

#include <stdio.h>
#include <stdint.h>
#include<math.h>
#include<string.h>

uint16_t binary_to_uint(const char *str) {
    // Your logic here
    int index =0;
    uint16_t result =0;
    int len = strlen(str)-1;
    for(int i = len;i>=0;i--)
    {
        if(str[i]=='1')
        {
            result += pow(2,index++);
        }else{
            index++;
        }
    }
    return result;
}

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

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

Solving Approach