Task:
This kata requires you to write an object that receives a file path 
and does operations on it.
NOTE FOR PYTHON USERS: You cannot use modules os.path, glob, and re
The purpose of this kata is to use string parsing, so you're not supposed to import external libraries. I could only enforce this in python.
Testing:
Python:
```python
>>> master = FileMaster('/Users/person1/Pictures/house.png')
>>> master.extension()
'png'
>>> master.filename()
'house'
>>> master.dirpath()
'/Users/person1/Pictures/'
```
class FileMaster():
    def __init__(self, filepath):
        self.path = filepath
        self._start_path = filepath.split('/')[:-1]
        self._end_path = filepath.split('/')[-1].split('.')
    def extension(self):
        return self._end_path[1]
    def filename(self):
        return self._end_path[0]
    def dirpath(self):
        return '/'.join(self._start_path)+'/'
class FileMaster():
    def __init__(self, filepath):
        self.path = filepath
        self._start_path = filepath.split('/')[:-1]
        self._end_path = filepath.split('/')[-1].split('.')
    def extension(self):
        return self._end_path[1]
    def filename(self):
        return self._end_path[0]
    def dirpath(self):
        return '/'.join(self._start_path)+'/'