Abstract This assignment is based on a class of problem solved in enterprise computing: extraction, transfor- mation, and loading. This is often referred to as ETL. The inputs will be data extracted from a leading aviation industry data and consulting firm, GCR. (See GCR.com for additional data.) The data is in a well known format where each data element is separated from the previous and following data elements by using a comma. It should be noted that this method of data manipulation is extremely common. The explicit order of the data fields and the desired outputs are defined in the "Specifications". objectives 1 The objectives of this assignment are to demonstrate proficiency in file lo, data structures, and data trans- formation using C language resources. Specifically, you will read in data from a text file, use that data to populate a data structure, and print that data to STDOUT by accessing the newly populated structure. 1.1 Extraction The first part of ETL is extraction. The filename of a text file will be passed to your program via the com- mand line. The data contained in that file is to be read into memory (i.e.. extracted). Your program will be compiled and run on Eustis using the following commands: gcc o etl hwletl.c /etl input File It is entirely possible that the input file either does not exist or is not where it is supposed to be. In such an event, your program should print an error message to STDERR that indicates which file is missing, then your program should exit safely. Use the following format for your error message (fileName should display the actual name of the missing file): etl ERROR: File fileName not found