input: Write a python function to remove all whitespace from a given string.
  assert text_without_whitespace("Hello World") == "HelloWorld"
  assert text_without_whitespace("  Leading and trailing spaces  ") == "Leadingandtrailingspaces"
  assert text_without_whitespace("Multiple    spaces   inside") == "Multiplespacesinside"
output: def text_without_whitespace(s: str) -> str:
      return ''.join(s.split())