input: Write a python function to convert a list of string numbers into a list of integers.
  assert convert_string_to_ints(["1", "2", "3"]) == [1, 2, 3]
  assert convert_string_to_ints(["10", "20", "30"]) == [10, 20, 30]
  assert convert_string_to_ints(["100", "200", "300"]) == [100, 200, 300]
output: def convert_string_to_ints(strings):
      return [int(s) for s in strings]