模拟，没什么好说的
class Solution:
def entityParser(self, text: str) -> str:
entityMap = {
'"': '"',
''': "'",
'>': '>',
'<': '<',
'⁄': '/',
'&': '&',
}
i = 0
n = len(text)
res = []
while i < n:
isEntity = False
if text[i] == '&':
for e in entityMap:
if text[i:i + len(e)] == e:
res.append(entityMap[e])
isEntity = True
i += len(e)
break
if not isEntity:
res.append(text[i])
i += 1
return ''.join(res)
