Convert Binary String to Integer Without strtol function or Libraries

Code

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

uint16_t binary_to_uint(const char *str) {
    // Your logic here
    int l = strlen(str);
    uint16_t num = 0;
    for(int x=l-1;x>=0;x--)
    {
        num += (str[x] - '0')*(int)pow(2,l-1-x);
    }
    return num;
}

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

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

Solving Approach