Challenge 3: Fix the Forgotten await — Possible Solution
====================================================================

import asyncio

async def greet(name):
    print(f"Hello, {name}!")

# --- broken version ---
async def main_broken():
    greet("Ada")   # WRONG — no await, this line does nothing observable

print("Running broken version:")
asyncio.run(main_broken())
print("(nothing printed above except this line — greet() never ran)")

# --- fixed version ---
async def main_fixed():
    await greet("Ada")

print("\nRunning fixed version:")
asyncio.run(main_fixed())

Output:
Running broken version:
(nothing printed above except this line — greet() never ran)

Running fixed version:
Hello, Ada!

(Python will also print a warning to stderr for the broken version, similar to:
RuntimeWarning: coroutine 'greet' was never awaited)

WHY THIS WORKS AS AN ANSWER
------------------------------
main_broken() reuses this chapter's own warn-box mistake exactly:
calling greet("Ada") without await creates a coroutine object (per the
chapter's own coro = say_hello() example) and then immediately
discards it, since nothing stores it, awaits it, or passes it to
gather(). The coroutine's body — the print("Hello, ...") line inside
greet — never actually executes, which is why nothing prints between
the two "Running..." messages, and why Python separately reports a
"coroutine was never awaited" warning: it detected a coroutine object
was created and later garbage-collected without ever being run.

main_fixed() changes exactly one thing: adding await in front of
greet("Ada"). This reuses the chapter's own core rule — await is what
actually drives a coroutine's code to run, pausing main_fixed() at
that point until greet("Ada") completes. With that single word added,
greet's print("Hello, Ada!") line runs correctly and appears in the
output.

Isolating the fix to one added keyword, with everything else about
greet() and the calling code identical, makes the exact cause of the
original bug — a missing await, not anything wrong with greet() itself
— completely unambiguous.