Message Processing from Input

Implement a program that processes messages read from either an input.txt file or standard input. Requirements: Each message consists of 5 tokens separated by spaces. Ensure this format is adhered to in each line. Be prepared to handle edge cases, such as empty fields within a message. Develop a strategy for dealing with these cases. Provide robust handling of all edge cases, and validate with unit tests. Output the processed message results. Example Input a b c d e Output Processed: a b c d e