project 0: a function that returns the sum of all its parameters. project 1: a function that prints numbers, followed by a new line. project 2: a function that prints strings, followed by a new line. project 3: a function that prints anything.
project 0: a function that returns the sum of all its parameters. project 1: a function that prints numbers, followed by a new line. project 2: a function that prints strings, followed by a new line. project 3: a function that prints anything.