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A.greet("Yigit") # Selam Yigit
A.greet("Sinem") # Selam Sinem
A.greet("Doe")   # Selam Doe

A.a(%{"name" => "John Doe"}) # Hi John Doe
A.b("title:Lorem ipsum")     # Title is Lorem ipsum

A.binary_pattern_matching(<<0x01, 0x00, 0x03, "meg", "rest">>)
# {:ok, "meg", "rest"}

A.fact(-5) # :error
A.fact(5)  # 120

A.last_two([])    # :none
A.last_two(["1"]) # :none
A.last_two(["1", "2"]) # ["1", "2"]

A.luhn_credit_card_validator("4242424242424242") # true
A.luhn_credit_card_validator("4242424242424243") # false