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.a

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 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.