input: Write a function named rewrite_code_with_list_comprehension that takes a given code block and rewrites it using list comprehensions. The function should return the rewritten code as a string.
  
  assert rewrite_code_with_list_comprehension("""even_numbers = []\nfor i in range(1,21):\n    if i % 2 == 0:\n        even_numbers.append(i)""") == "even_numbers = [i for i in range(1, 21) if i % 2 == 0]"
output: def rewrite_code_with_list_comprehension(code):
      lines = code.strip().split('\n')
      var_name = lines[0].split('=')[0].strip()
      start, end = lines[1].split('range(')[1].split(')')[0].split(',')
      condition = lines[2].split('if ')[1].strip()
      return f"{var_name} = [{lines[1].split('for ')[1].split(':')[0].strip()} {condition}]"