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 sum=0;
    int p=1;
    int length=0;
    while(str[length]!='\0')length++;
    for(int i=length-1;i>=0;i--){
        sum+=(str[i]-'0')*p;
        p*=2;
    }
    return sum;
}

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

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