Given an absolute path for a file Unixstyle, simplify it. For example, path  home,  home path  a.b....c,  c  Did you consider the case where path  ..? In this case, you should return .  Another corner case is the path might contain multiple slashes '' together, such as homefoo. In this case, you should ignore redundant slashes and return homefoo. :type path: str :rtype: str
def simplify_path(path):
    """
    :type path: str
    :rtype: str
    """
    skip = {'..', '.', ''}
    stack = []
    paths = path.split('/')
    for tok in paths:
        if tok == '..':
            if stack:
                stack.pop()
        elif tok not in skip:
            stack.append(tok)
    return '/' + '/'.join(stack)
