input: Write a function to calculate the running total of numbers in a given list using numpy. The function should return a new array where each element is the cumulative sum of the elements up to that position in the input list. If the input list is empty, the function should return an empty list.
  assert np.array_equal(runningTotal([1, 2, 3, 4]), [1, 3, 6, 10])
  assert np.array_equal(runningTotal([10, 20, 30]), [10, 30, 60])
  assert np.array_equal(runningTotal([5]), [5])
  assert np.array_equal(runningTotal([]), [])
  assert np.array_equal(runningTotal([-1, 1, -1, 1]), [-1, 0, -1, 0])
output: import numpy as np
  
  def runningTotal(lst):
      if not lst:
          return []
      return np.cumsum(lst).tolist()