Parsing Graphite Response

stat.ino

#include <Arduino.h>

String resp;

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

  Serial.write("\r\n");
  Serial.println("-----------------------");
  Serial.println("Arduino Context.IO demo");
}

void loop()
{
  resp = "movingAverage(hitcount(stats.applications.signups.gmail, \"1min\"),20.0),1354819860,1354821660,60|None,None,None,None,None,None,None,None,None,None,None,None,None,None,None,None,None,None,None,0.7,0.75,0.7,0.75,0.75,0.8,0.8,0.85,0.8,0.75,0.7";
  
  Serial.println(resp);
  Serial.println(get_last_value(&resp));
  
  delay(5000);
}

float get_last_value(String *line)
{
  String substring = line->substring(line->lastIndexOf(",")+1);
  return string_to_float(&substring);
}

float string_to_float(String *string)
{
  char chararray [string->length()+1];
  string->toCharArray(chararray, string->length()+1);
  return atof(chararray);
}