Convert Date

Simple

Funkcja ta powinna pobierać ciąg daty w formacie dd/mm/yyyy i konwertować go do formatu yyyy-mm-dd. Jeśli dane wejściowe nie są w poprawnym formacie, funkcja powinna zwrócić komunikat o błędzie "Error: Invalid date.".

example

Wejście: String (str).

Wyjście: String (str).

Przykłady:

assert convert_date("25/12/2021") == "2021-12-25"
assert...

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date
string

by:

freeman_lex

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