input: 
  def VersionControl(lines):
      """ Implemented a basic version control system in Python that keeps track of changes in the code.
      The system logs changes into a file and allows for restoring to a prior version.
      Example:
      version_control = VersionControl(['print("Hello, World!")'])
      version_control.commit()
      version_control.restore()
      """
      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))
          log_file.close()
   
      def restore(self):
          log_file = open("log_file.txt", "r")
          lines = log_file.readlines()
          to_mark = self.mark-1
   
          self.lines = lines[to_mark]
          log_file.close()
          return self.lines
  
output:     def __init__(self, lines):
          self.lines = lines
          self.mark = 0
          self.log_file = "log_file.txt"
          with open(self.log_file, "w") as f:
              f.write("")
  
      def commit(self):
          self.mark += 1
          with open(self.log_file, "a+") as log_file:
              log_file.write(f"{self.mark}: {self.lines}\n")
  
      def restore(self):
          with open(self.log_file, "r") as log_file:
              lines = log_file.readlines()
          if self.mark > 0:
              self.mark -= 1
          self.lines = eval(lines[self.mark].split(": ", 1)[1])
          return self.lines