input: 
  from typing import List
  
  def version_control_implementation(lines: List[str]) -> VersionControl:
      """Implement a basic version control system in Python that keeps track of changes in the code.
      The VersionControl class should have methods to commit changes and restore to a previous state.
      >>> version_control_implementation(['print("Hello World!")', 'a = 5']).commit()
      >>> version_control_implementation(['print("Hello World!")', 'a = 5']).restore()
      """
      class VersionControl:
          def __init__(self, lines):
              self.lines = lines
              self.mark = 0
  
          def commit(self):
              self.mark += 1
              log_file = open("log_file.txt", "a+")
              log_file.write(str(self.mark) + ": " + str(self.lines) + "\n")
              log_file.close()
  
          def restore(self):
              log_file = open("log_file.txt", "r")
              lines = log_file.readlines()
              to_mark = self.mark-1
  
              if to_mark >= 0 and to_mark < len(lines):
                  self.lines = lines[to_mark].strip().split(": ")[1]
              log_file.close()
      
      return VersionControl(lines)
  
output:     
      class VersionControl:
          def __init__(self, lines):
              self.lines = lines
              self.mark = 0
  
          def commit(self):
              self.mark += 1
              log_file = open("log_file.txt", "a+")
              log_file.write(str(self.mark) + ": " + str(self.lines) + "\n")
              log_file.close()
  
          def restore(self):
              log_file = open("log_file.txt", "r")
              lines = log_file.readlines()
              to_mark = self.mark-1
  
              if to_mark >= 0 and to_mark < len(lines):
                  self.lines = eval(lines[to_mark].strip().split(": ")[1])
              log_file.close()
      
      return VersionControl(lines)
  