char *strdup(const char *s)
{
    char *new = (char *) malloc ((strlen(s)+1) * sizeof(char));
    if (new == NULL)
        return NULL;
    return memcpy(new, s, (strlen(s)+1) * sizeof(char));
}

char *strdup(const char *s)
{
    char *new = (char *) malloc (strlen(s) * sizeof(char));
    return memcpy(new, s, (strlen(s) * sizeof(char));
}

char *strdup(const char *s)
{
    char *new = (char *) calloc (strlen(s) * sizeof(char));
    if (new == NULL)
        return NULL;
    return memcpy(new, s, (strlen(s) * sizeof(char)));
}

char *strdup(const char *s)
{
    char new [strlen(s)+1];
    return memcpy(new, s, (strlen(s)+1) * sizeof(char));
}

char *strdup(const char * s)
{
    void *new = malloc (strlen(s+1));
    return memcpy(new, s, strlen(s+1));
}

char *strdup(const char s)
{
    void *new = malloc (strlen(s));
    if (new == NULL)
        return NULL;
    return memcpy(new, s, strlen(s));
}

char *strdup(const char *s)
{
    char *new = (char *) malloc ((strlen(s)+1) * sizeof(char));
    if (!new)
        return NULL;
    return memcpy(new, s, (strlen(s)+1) * sizeof(char));
}