@abi-appusamy9932 Ok the issue with the LED library code, I believe, is that you need to call the updates in a subsystem periodic for it to do anything.

You create the LEDStrip in RobotContainer (line 51/52)
public final LedIOCANdle candle = new LedIOCANdle(22, 37); public final LedStrip leds = new LedStrip(candle, "leds");

LEDStrip is a subsystem (so should have its periodic )
@Override public void periodic() { io.updateInputs(inputs); //Logger.processInputs(name, inputs); }

That periodic updates io (which is LedIOCANdle class).
@Override public void updateInputs(LedIOInputs inputs) { inputs.firstHalfColor = firstColor; inputs.secondHalfColor = secondColor; inputs.firstHalfEffect = firstEffect; inputs.secondHalfEffect = secondEffect; }

There isn't anything in any of the periodics to call sendSolidColor() or applyEffects(). You probably need to add an update method to the ledIOCANDle that is called in the LEDStrip.Periodic() that can make sure either the sendSolidColor or the applyEffect functions are called.