input: Write a function that takes a Python function as input and checks for potential issues related to modifying a list while iterating over it. If such an issue is detected, fix the code by making a copy of the list before iteration. If no such issue is found, return the original function. The function should return the corrected function if necessary.
  
  def fix_list_iteration(func):
      `# fixed function code here`
      return func
  
  assert fix_list_iteration(lambda list: list *= 2 while iterating(list)) == `# corrected function code`
  assert fix_list_iteration(lambda list: list.append(item) for item in list) == `# corrected function code`
  assert fix_list_iteration(lambda list: list.remove(item) for item in list) == `# corrected function code`
  assert fix_list_iteration(lambda list: print(item) for item in list) == `# unchanged function code`
  assert fix_list_iteration(lambda list: list.sort()) == `# unchanged function code`
output: def fix_list_iteration(func):
      import ast
      import astor
  
      def is_modifying_list(node):
          if isinstance(node, ast.For) and isinstance(node.iter, ast.Name) and node.iter.id == 'list':
              for body_node in node.body:
                  if isinstance(body_node, ast.Expr) and isinstance(body_node.value, ast.Call):
                      if isinstance(body_node.value.func, ast.Attribute) and body_node.value.func.attr in ['append', 'remove']:
                          return True
          return False
  
      tree = ast.parse(astor.to_source(func))
      for node in ast.walk(tree):
          if is_modifying_list(node):
              for_node = node
              new_iter = ast.Call(func=ast.Name(id='list', ctx=ast.Load()), args=[ast.Name(id='list', ctx=ast.Load())], keywords=[])
              for_node.iter = new_iter
              break
  
      fixed_code = astor.to_source(tree)
      exec(fixed_code, globals())
      return globals()[func.__name__]
      return func