typedef char* String;

void strip(String string){
    unsigned int i = 2;
    unsigned int x = 2;
    char c;
    while((c = string[i++]) != '\0')
    {
        if(isalnum(c) || c =='.' )
        {
            string[x++] = c;
        }
    }
    string[x]='\0';
}

int countChars(char *s, char c)
{
    return *s == '\0' ? 0 : countChars(s + 1, c) + (*s == c);
}