Remove non-alphanumeric characters from a C string.

removeNonAlphaNum.c

void stringRemoveNonAlphaNum(char *str)
{
    unsigned long i = 0;
    unsigned long j = 0;
    char c;

    while ((c = str[i++]) != '\0')
    {
        if (isalnum(c))
        {
            str[j++] = c;
        }
    }
    str[j] = '\0';
//    return str;
}