Where does the Arduino IDE keep the empty sketch template?

Doe anyone know where the Arduino IDE keeps the template for the default sketch? I want to make my initial sketch able to support 3 CPU cores.

When I create a new sketch, I need something like:

void setup() {
// put your setup code here, to run once on CPU 0:

}

void loop() {
// put your main code here, to run repeatedly on CPU 0:

}

void setup_cpu1() {
// put your setup code here, to run once on CPU 1:

}

void loop_cpu1() {
// put your main code here, to run repeatedly on CPU 1:

}

void setup_cpu2() {
// put your setup code here, to run once on CPU 2:

}

void loop_cpu2() {
// put your main code here, to run repeatedly on CPU 2:

}

Thanks!

At the top of the IDE , file->Examples->Basics->BareMinimum.

Thanks!