Show me the steps to soWrite a function$$find$\_$key$\_$of$\_$c$($filename$)$that takes a string representing a file$$s name as a parameter. The file contains melodies written as strings of notes on each line. Each line should be considered a separate melody. The function should open and read the file and return a list of all the melodies in the key of C$.$ For the purposes of this function, assume that any melody that starts$$and$$ends with the note$$C$$is in the key of C$.$ If the file specified as a parameter is empty or it does not contain any melodies in the key of C$,$ your function should return an empty list. You can assume that the file exists. You may find the string$$s$$strip$()$method useful if there are newline characters $($

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