input: from typing import List
  
  def to_lower_conversion(strings: List[str]) -> List[str]:
      """ Convert all characters of each string in the given list to lowercase.
      >>> to_lower_conversion(["HELLO", "WORLD"])
      ["hello", "world"]
      >>> to_lower_conversion(["MyNaMe", "isJohn"])
      ["myname", "isjohn"]
      """
output:     return [s.lower() for s in strings]