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 value = 0;
    const char * ptr = str;
    uint8_t strlen = 0;

    while (*ptr++) {
        strlen++;
    }

    for (int i = 0; i < strlen; i++) {
        value |= ((str[i]-48) << (strlen-1-i));
    }
    return value;
}

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

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

Solving Approach