Simplify Directory Path

Given an absolute path for a file (Unix-style), simplify it.

Examples:

path = "/home/", => "/home"
path = "/a/./b/../../c/", => "/c"

Note that absolute path always begin with ‘/’ ( root directory )
Path will not have whitespace characters.

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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