input: from typing import List
  
  
  class VersionControl:
      def __init__(self, lines: List[str]):
          self.lines = lines
          self.mark = 0
   
      def commit(self) -> None:
          """ Save the current state of the code and increment the mark.
          >>> vc = VersionControl(["print('Hello, World!')"])
          >>> vc.commit()
          >>> file = open("log_file.txt", "r")
          >>> print(file.read().strip())
          "1: ['print(\\'Hello, World!\\')']"
          >>> file.close()
          """
          self.mark += 1
          log_file = open("log_file.txt", "a+")
          log_file.write(str(self.mark) + ": " + str(self.lines))
          log_file.close()
   
      def restore(self) -> None:
          """ Restore the code to the previous committed state.
          >>> vc = VersionControl(["print('Hello, World!')"])
          >>> vc.commit()
          >>> vc.lines = ["print('Goodbye, World!')"]
          >>> vc.restore()
          >>> print(vc.lines)
          "['print(\\'Hello, World!\\')']"
          """
          log_file = open("log_file.txt", "r")
          lines = log_file.readlines()
          to_mark = self.mark-1
   
          self.lines = lines[to_mark]
          log_file.close()
output:         log_file = open("log_file.txt", "r")
          lines = log_file.readlines()
          log_file.close()
          if lines:
              last_commit = lines[-1].strip().split(": ")[1]
              self.lines = eval(last_commit)
              self.mark -= 1