const int MAX_STRING_LEN = 20; // set this to the largest string
 // you will process
 
char stringList[] = "Peter,Paul,Mary"; // an example string
char stringBuffer[MAX_STRING_LEN+1]; // a static buffer for computation and output
void setup()
{
 Serial.begin(9600);
}
void loop()
{
 char *str;
 char *p;
 strncpy(stringBuffer, stringList, MAX_STRING_LEN); // copy source string
 Serial.println(stringBuffer); // show the source string
 
 for( str = strtok_r(stringBuffer, ",", &p); // split using comma
 str; // loop while str is not null
 str = strtok_r(NULL, ",", &p) // get subsequent tokens
 )
 {
 Serial.println(str);
 }
 delay(5000);
}