int redPin=8;
int greenPin=9;
int bluePin=10;
String myColor;
String msg=("What color do you want?");
void setup() {
  // put your setup code here, to run once:
pinMode(redPin, OUTPUT);
pinMode(greenPin, OUTPUT);
pinMode(bluePin, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
Serial.println(msg);
while(Serial.available()==0);
myColor=Serial.readString();
if(myColor=="red");
digitalWrite(redPin, HIGH);
digitalWrite(greenPin, LOW);
digitalWrite(bluePin, LOW);
if (myColor=="green");
digitalWrite(redPin, LOW);
digitalWrite(greenPin,HIGH);
digitalWrite(bluePin, LOW);
if (myColor=="blue");
digitalWrite(redPin, LOW);
digitalWrite(greenPin, LOW);
digitalWrite(bluePin, HIGH);
if(myColor=="off");
digitalWrite(redPin, LOW);
digitalWrite(greenPin, LOW);
digitalWrite(bluePin, LOW);

}