Given a string, return a new string that has transformed based on the input:
* Change case of every character, ie. lower case to upper case, upper case to lower case.
* Reverse the order of words from the input.
**Note:** You will have to handle multiple spaces, and leading/trailing spaces.
For example:
```
"Example Input" ==> "iNPUT eXAMPLE"
```
You may assume the input only contain English alphabet and spaces.
def string_transformer(s):
    return ' '.join(s.swapcase().split(' ')[::-1])
def string_transformer(s):
    return ' '.join(s.swapcase().split(' ')[::-1])