Convert Binary String to Integer Without strtol function or Libraries

Code

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

uint16_t binary_to_uint(const char *str) {
    // Your logic here
    uint16_t a=0;
    uint16_t b=0;
    while(true){
        if(*(str+b)=='\0'){
            break;
        }
        b++;
    }
    for(int i=0;i<b;i++){
        a|=((int)*(str+i)-48)<<(b-1-i);
    }
    return a;
    }
int main() {
    char bin[20];
    scanf("%s", bin);

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

Solving Approach