Practice String Formatting & Parsing

Write a function format_transactions that receives a list of strings, each representing a trade in the form "item=price". The price may be an integer or a float and may have surrounding whitespace. Your function must:

1. Parse each line into a name and a numeric price.
2. Return a single string containing one line per trade.
3. Each line should have the name left‑aligned in a 10‑character field, followed by a dollar sign and the price right‑aligned in a 7‑character field, shown with exactly two decimal places.
4. Lines are separated by "\n"; an empty input list should produce an empty string.

Example

format_transactions(["apple=1.5", "banana=2"]) 
# returns "apple     $   1.50\nbanana    $   2.00"