index.js

  // calculate angle  
  let angle = 0.0;
  angle = angleBetween(wrists);
  
  // right condition
  if(angle < -25) {
      turnRight();
      toRight = true;
      toLeft = false;
  } else if(toRight) {
      straight();
      toRight = false;
  }
  
  // left condition
  if(angle > 25) {
      turnLeft();
      toLeft = true;
      turningRight = false;
  } else if(toLeft) {
      toLeft = false;
  }