input: Write a function to calculate the total sum of all elements of a given list. If the list is empty, return 0.
  
  assert calculate_sum_of_list([1, 2, 3, 4]) == 10
  assert calculate_sum_of_list([10, 20, 30]) == 60
  assert calculate_sum_of_list([]) == 0
  assert calculate_sum_of_list([-1, 1, -2, 2]) == 0
  assert calculate_sum_of_list([1]) == 1
output: def calculate_sum_of_list(lst):
      return sum(lst)