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

In this exercise, you will develop a function named decode$($message$\_$file$).$ 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:

$3$ love

$6$ computers

$2$ dogs

$4$ cats

$1$ 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 numbers are placed into the pyramid in ascending order, with each line of the pyramid having one more number than the line above it$.$ The smallest number is $1,$ and the numbers increase consecutively, 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".