input: def VersionControl(lines):
      """Implement a basic version control system that keeps track of changes in the code.
      The system should allow to commit changes and restore to the previously stored state.
      The changes will be stored in a file named 'log_file.txt'.
      
      Example:
      for VersionControl(['line1', 'line2']) == Output would involve the function committing and restoring lines of code as described in the class.
      """
output:     
      import os
  
      def commit(lines):
          with open('log_file.txt', 'a') as f:
              f.write('\n'.join(lines) + '\n')
  
      def restore():
          if os.path.exists('log_file.txt'):
              with open('log_file.txt', 'r') as f:
                  return f.read().splitlines()
          return []
  
      commit(lines)
      return restore()
  