Your task is to develop an email extractor algorithm $($flowchart AND pseudocode$)$ and then write a python modular program that implements the algorithm. The python program should read text from input file and extracts all email addresses within the text. An email address has the following format:

email$\_$id@domain$\_$name

The email$\_$id is the part preceding the @ symbol and it may contain only letters $(a-z,A-z),$ digits $(0-9),$ and any of the symbols: $.,$ $$,\_,$ or $-.$ Note no other character is allowed in the email$\_$id$.$ The next part is the domain$\_$name which is composed of domain.ext $(.$ext$)*$ where domain$\_$name may contain only letters $(a-z,A-Z,$ digits $(0-9,$ and only the two symbols $.$ or $-.$ Note that domain$\_$name may allow zero or more extra $.$ ext parts $($as indicated by $*)$ but it must at least contain one $.$ ext part. The table below give some examples of valid emails: