code: func (c4 *Seefor) UseTimer(timer *Timer) *Timer {
  	if timer == nil {
  		if c4.timer != nil {
  			return c4.timer
  		}
  		timer = NewTimer()
  	}
  	c4.timer = timer
  
  	return c4.timer
  }
docs: // UseTimer set timer for meaturing endpoint performance.
  // If timer is nil and no timer exists
  // then a new timer will be created 
  // else existing timer will be returned.
  // You can serve statistics internal using Timer as handler