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

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

uint16_t binary_to_uint(const char *str) {
    int num = 0;
    int i = 0;
    int k = 0;
    
    for( i=0; str[i] != '\0'; i++)
    {
    }
    
    for(int j= i-1;j >=0;j--)
    {
        num += (str[j] - '0')*(1<<k);
        k++;
    }
    
    return num;
}


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

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