This mission is inspired by the following Brian Bilston's facebook post:

Split a given text into multiline one with "\n", where each line includes number of words equal to the current Fibonacci number.

Here are some clarifications:

• Fibonacci sequence starts from 0, 1, but the result string should include only non-empty lines;
• in case, there are not enough words for current line - complement to proper length with "_";
• punctuation marks are considered as a part of a previous or next word.

Let's look at the schematic example ("w" for a word):

"w w w w w w w w" -> '''w
                        w
                        w w
                        w w w
                        w _ _ _ _'''

Input: A string (str).

Output: A string (str).

Examples:

assert fibo_poem("") == ""
assert fibo_poem("Django framework") == "Django\nframework"
assert fibo_poem("Zen of Python") == "Zen\nof\nPython _"
assert (
    fibo_poem("There are three kinds of lies: Lies, damned lies, and the benchmarks.")
    == "There\nare\nthree kinds\nof lies: Lies,\ndamned lies, and the benchmarks."
)