118. Convert Binary String to Integer Without strtol function or Libraries

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


uint16_t binary_to_uint(const char *str) {
    uint16_t sum = 0;
    int len = strlen(str);
    for(int i = len - 1; i >= 0; i--) {
        sum += (str[i] == '1') * (uint16_t)pow(2, len - 1 - i);
    }
    return sum;
}


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

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