input: Write a function to compute the running total of numbers in a given list using numpy. If the input list is empty, return an empty list. The function should return an array with the cumulative sum of the input list.
  assert np.array_equal(runningTotal([1, 2, 3, 4]), np.array([1, 3, 6, 10]))
  assert np.array_equal(runningTotal([5, 3, 8, 1]), np.array([5, 8, 16, 17]))
  assert np.array_equal(runningTotal([10]), np.array([10]))
  assert np.array_equal(runningTotal([]), np.array([]))
output: import numpy as np
  
  def runningTotal(lst):
      if not lst:
          return np.array([])
      return np.cumsum(lst)