Repository for interviewing / programming tests.
Implement a function detecting whether a string is a palindrome or not.
Example on valid input: A Santa at Nasa, deleveled, Dumb mud.
Example on invalid input: Hello world.
In a list of license plate numbers (in this case in Swedish format, with three letters followed by three digits, like ABC123) detect whether the list contains any duplicates or not.
The function should return true if the list contains duplicates and false if not.
If interviewing senior developers, the problem can be tweaked to find an effective solution, which only looks at every license plate number at most once.