input: from typing import List
  
  
  def reverse_string(strings: List[str]) -> List[str]:
      """Reverse a list of strings.
      >>> reverse_string(["hello", "world"])
      ['olleh', 'dlrow']
      >>> reverse_string(["123", "abc"])
      ['321', 'cba']
      """
output:     return [s[::-1] for s in strings]