Convert Binary String to Integer Without strtol function or Libraries

Code

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

#define BASE 2

uint16_t binary_to_uint(const char *str) {
    // Your logic here
    uint16_t num = 0;
    uint8_t len = 0;
    while(str[len] != '\0'){
        len++;
    }
    for(int i = 0;i<len;i++){
        num = num*BASE+(str[i]-'0');
    }
    return num;
}

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

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

Solving Approach