Ex. 9

char *Teste (char *s1, const char *s2) {
    char *aux=s1, *aux_=s2;
    int i, aux1=0, aux2=0, aux3=0;
    //(a)
    for (i=0; s1[i] != '\0'; i++)
    {
        if (s2[i] == '\0')
            break;
        if (s1[i+1] == '\0' && s2[i+1] != '\0')
        {
            *(aux_+i+1) = '\0';
            break;
        }
        *(aux_+i) = s1[i];
    }
    //(b)
    while (*s1 != '\0')
        s1++;
    if (s1 < s2)
    {
        while(s1 != s2)
        {
            *s1 = '\0';
            s1++;
        }
    }
    s1 = aux;
    //(c)
    for (i=0; s2[i] != '\0'; i++)
    {
        aux1=aux1+(int)s1[i];
        aux2=aux2+(int)s2[i];
    }
    if (aux1 == aux2)
        aux3 = 0;
    if (aux1 > aux2)
        aux3 = 1;
    if (aux1 < aux2)
        aux3 = -1;
    //(d)
    for (i=0; s2[i] != '\0'; i++)
    {
        if (s1[i] == '\0')
            break;
        if (s2[i+1] == '\0' && s1[i+1] != '\0')
        {
            s1=realloc(s1,(i+1)*sizeof(char));
            s1[i+1] = '\0';
            break;
        }
        s1[i] = s2[i];
    }
    //(e)
    while (*s1 != '\0')
        s1++;
    s1++;
    for (i=0; s2[i] != '\0'; i++)
    {
        *s1 = s2[i];
        s1++;
    }

    return aux;
}