Part $3-$ Coding Exercise: Decoding a Message from a Text File

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In this exercise, you will develop a function named 'decode$($message$\_$file$)\text{'}.$ This function should read an encoded message from a $.$txt file and return its decoded version as a string. Note that you can write your code using any language and IDE you want $($Python is preferred if possible, but not mandatory$).$

Your function must be able to process an input file with the following format:

love

computers

dogs

cats

I

$5$ you

In this file, each line contains a number followed by a word. The task is to decode a hidden message based on the arrangement of these numbers into a "pyramid" structure. The pyramid increases by one number per line, like so:

$1$

$23$

$456$

The key to decoding the message is to use the words corresponding to the numbers at the end of each pyramid line $($in this example, $1,3,$ and $6).$ You should ignore all the other words. So for the example input file above, the message words are:

$1$: I

$3$: love

$6$: computers

and your function should return the string "I love computers".

Please submit the complete code for the decode function along with a brief explanation of how your code works:

Your explanation should be written as a few sentences at minimum, please don't rely just on comments.

To verify that your code works, please download this text input file $($direct download link$)$ or copy this list into a text editor of your choosing and use your function to decode the message $($this file was recently updated; your file should begin with $296$ land$).$

Paste the decoded message in the box below, in all lowercase with no punctuation or leading$/$trailing whitespace around the word sequence $($necessary for automated text matching$).$ Note: The message may or may not be a coherent sentence.

So for the example we shared above, you'd paste 'i love computers' without the quotes.