请实现如下形式的字符串的反转。
input: “what is your name.”
output: “name. Your is what”
def func(s):
stack1 = []
ss = s.split(' ')
for i in ss:
stack1.append(i)
stack2 = []
while stack1:
stack2.append(stack1[-1])
stack2.append(' ')
del stack1[-1]
del stack2[-1]
return ''.join(stack2)