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
    int i = 0, x = 0;
    uint16_t res = 0;
    char tmp[20];
    while(str[i]){
        tmp[i] = str[i];
        i++;
    }
    while(i > 0){
        res =  res | ((tmp[--i] - '0') << x);
        x ++ ;
    }
    return res;
}

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

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

Solving Approach