Cassidoo newsletter every other toy problem

every_other.h

int every_other(char *str) {
    // Empty string edge case
    if (!(*str)) return 0;

    char current = *str;
    int counter = 0;

    str++;

    while (*str) {
        if (current == *str) {
            counter++;
        }
        current = *str;
        str++;
    }

    return counter;
}