Arduino Code For Website Interaction

#include <string.h>
#include <stdlib.h>
#include <math.h>

#Written to control Fan and Heating device through a MOSFET
#to create a temperature controlled incubator
#Data received through the serial port changes the value of the temperature

int temppin = 2;
int heatpin = 3;
int fanpin = 4;

char *settemp;
char *temperature;
double currtemp;

int start = 0;
int y = 0;

int temp_find(double totemp)
{
  int heatval;
  int fanval;
  int timeout = 0;
  int chances = 0;

  while(1)
  {

   currtemp = analogRead(temppin);
   if(totemp > (currtemp - 1) && totemp < (currtemp + 1)){ break; }
   else if(totemp > currtemp)
   {
     heatval = log(totemp/currtemp)*100;
     if(heatval > 256){ heatval = 256; }
     digitalWrite(heatpin, heatval);
   }
   else if(totemp < currtemp)
   {
     fanval = log(totemp/currtemp)*100;
     if(fanval > 256){ fanval = 256; }
     digitalWrite(fanpin, fanval);
   }
   if(timeout > 1000 && chances < 3)
   {
     Serial.println("Error cannot stabilize temp. Pausing for 5 seconds");
     delay(5000);
     chances++;
     timeout = 0;
   }
   if(chances >=3)
   {
     Serial.println("Something is wrong with your temperature control!!!!");
   }

   timeout++;
  }
  delay(50);
  return currtemp;
}


char *token(char buffer[])
{
   int h;
   char stringser[255] = {0};
   for(h = 0; h < strlen(buffer); h++)
   {
     if(buffer[h] != ':'){ stringser[h] = buffer[h]; }
     else{ break; }
   }

   return stringser;

}
void *clalloc(void *p, int val, int sizem)
{
  p = malloc(sizem);
  memset(p, val, sizem);
  return p;
}

void setup()
{
  Serial.begin(9600);

  clalloc(temperature, '\0', (sizeof(char)*10));
  clalloc(settemp,'\0', (sizeof(char)*10));

  settemp = "50";


}

void loop()
{
  char buff[254] = {0};
  int x = 0;
  char *empty;
  char *temp;

  temperature = settemp;

  while(Serial.available() > 0)
  {

   buff[x] = Serial.read();
   //if(buff[x] == '\n'){ break; }
   x++;
   if(x == 254){ break; }
  }

  if(strstr(buff, "ID"))
  {
   Serial.println("ID:Thermo:IDEND");
  }

  if(strstr(buff, "Temp"))
  {
    temperature = token(buff);
    settemp = temperature;

    Serial.print(temperature);
    Serial.println(":Temp:SUCCESS");

  }
  else
  { temperature = settemp;}

  Serial.print(temperature);
  Serial.print(":");
  Serial.print(y);
  Serial.println(":END");

  y++;
  delay(1000);
}