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:

$3$ love

$6$ computers

$2$ dogs

$4$ cats

$1$ I

$5$ you

the pyramid having one more number than the line above it$.$ The smallest number is $1,$ and the numbers increase consecutively, like so:

$1$: I

$3$: love

$6$: computers

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