void reply(int sock)
 
{
 
   int n, i; //declare variables
 
   char buffer[256]; //to store input from client
 
     //get message from client
 
     bzero(buffer,256);     
 
     n = read(sock,buffer,255);
 
 
 
     //prompt error if cannot read
 
     if (n < 0) error("ERROR reading from socket");
 
     //change all char to lower
     for(i=0; buffer[i]; i++)
     buffer[i]=tolower(buffer[i]);
 
    //Need to check the text file here. to get a reply. 
   // If nothing matches, reply with "Sorry i do not have the answer."
 
     //send message back to client
     n = write(sock, buffer, 18);
 
     if (n < 0) error("ERROR writing to socket")
 
 
}