Ruby Online Test

A palindrome is a word that reads the same backward or forward.

Write a function that checks if a given word is a palindrome. Character case should be ignored.

For example, is_palindrome("Deleveled") should return true as character case should be ignored, resulting in "deleveled", which is a palindrome since it reads the same backward and forward.

Implement a group_by_owners function that:

• Accepts a hash containing the file owner name for each file name.
• Returns a hash containing an array of file names for each owner name, in any order.

For example, for hash {'Input.txt' => 'Randy', 'Code.py' => 'Stan', 'Output.txt' => 'Randy'} the group_by_owners function should return {'Randy' => ['Input.txt', 'Output.txt'], 'Stan' => ['Code.py']}.

Write a function that provides change directory (cd) function for an abstract file system.

Notes:

• Root path is '/'.
• Path separator is '/'.
• Parent directory is addressable as '..'.
• Directory names consist only of English alphabet letters (A-Z and a-z).
• The function should support both relative and absolute paths.
• The function will not be passed any invalid paths.
• Do not use built-in path-related functions.

For example:

path = Path.new('/a/b/c/d')
path.cd('../x')
puts path.current_path

should display '/a/b/c/x'.