LC 71 Simplify path

We split the input based on ‘/’.If multiple /// occurs, split will append empty strs in the back.
We will skip . and .. and ” during our iteration through split list and insert other strings in res.
But if we see .., we need to pop one entry from res.

    def simplifyPath(self, path: str) -> str:
        res = []
        skip_set = {'.','..',''}
        for s in path.split('/'):
            if s not in skip_set:        
            if s == '..' and res:
        res_str = ""
        for direc in res:
            res_str += direc + '/'

        return "/" + res_str[:-1]

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