text: def countE_v1(s):
      count = 0
      for c in s:
          if c.lower() =='e':
              count = count + 1
      return count
  
  def countE_v2(s):
      count = 0
      for c in s:
          if c =='e' or c=='E':
              count = count + 1
      return count
  
  
  def countEWrong(s):
      count = 0
      for c in s:
          if c =='e' or 'E':
              count = count + 1
      return count
  
  def countE(s):
      count = 0
      for c in s.lower():
          if c =='e':
              count = count + 1
      return count
  
  
  def test_countE_1():
      assert countE("The")==1
  
  def test_countE_2():
      assert countE("UCSB")==0
  
  def test_countE_3():
      assert countE("Eagle")==2
  