/*parte k axo k me da segmentation fault*/
/*codigo dentro do main() */


switch(argc)
{
case 3  : if(argv[1][1]=='c' && argv[1][2]=='a' && argv[1][3]=='t')
                                   {
                                      if(strlen(argv[2] >= 30) || strlen(argv[2]<=0) )
                                        {
                                           printf("Maximo de 30 caracteres\n");
                                           return;
                                         }
                                    
                                      else
                                        concat(argv[2]);  /*funcao externa*/
                                   }break;
}


/*funcao concat */


void concat(char *s)
{
  FILE *fi,*fo;
  char ch;

 fi=fopen("words.txt","r");
 if (fi==NULL)
 {
   printf("Cannot open words.txt\n");
   return;
 }
  fo=fopen("concat.txt","w");
  if(fo==NULL)
   {
       printf("Cannot Create or open concat.txt\n");
       return;
   }

while(ch!=EOF)
{
 while(ch!='\n')
  {
   ch=fgetc(fi);
   fprintf(fo,"%c",ch);
  }
 fprintf(fo,"%s",s);
 fprintf(fo,"%s",'\n');
}

fclose(fi);
fclose(fo);

}