input: from typing import List
  
  def convert_string_to_lowercase(strings: List[str]) -> List[str]:
      """ Convert all characters of each string in the list to lowercase.
      >>> convert_string_to_lowercase(["HELLO", "WORLD"])
      ["hello", "world"]
      >>> convert_string_to_lowercase(["Python", "Programming"])
      ["python", "programming"]
      """
output:     return [s.lower() for s in strings]