Convert Binary String to Integer Without strtol function or Libraries

Code

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

uint16_t binary_to_uint(const char *str) {
    // Your logic here
    int num=0,i,j,k=0;
    j=strlen(str);
    for(i=j-1;i>=0;i--)
    {
        if(str[i]=='1')
        num|=1<<k;
        k++;
    }
    return num;
}

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

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

Solving Approach