void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println("Hello, ESP32!");
String fname = "dasdadiq.mp4";
String ext = fname.substring(fname.length() - 4);
Serial.println(ext);
}
void loop() {
// put your main code here, to run repeatedly:
delay(10); // this speeds up the simulation
}