Context. Convert a list of Celsius temperatures to Fahrenheit in one shot — no loops.
Your task. Write celsius_to_fahrenheit(celsius) that takes a list of Celsius numbers and returns a NumPy array of the matching Fahrenheit values. Formula: F = C * 9/5 + 32.
Example. [0, 100] → array([32., 212.]).
Notes. Use NumPy broadcasting — no for-loops. Empty input → empty array.