should be done in .sed

b) A company has a set of letters that need to be modified. As an example consider the following file called letter.txt containing a company letter 1234 7 Oaks Lane Denton, TX 76509-4321 (682) 543-7890 February 7th, 2021 Ms. Sue Jones 1515 Mockingbird Lane Apartment 2701 Denton, TX 76509 Dear Mrs. Jones, This letter is to inform you that you have won the super coder contest. To claim your winnings, you may visit our office or call our chain hotline (654) 817-4321, Mention your clain number 0687. Sincerely, Lois Lane Write a complete sed script called minori.sed that will modify the company's letters in the following ways. Note that this letter is an example. Your program will be tested against several similar letters. Note that spacing may be different in each letter. 1. Preprocessing a. Change the area code of the phone number in the heading to 800 b. Remove the parentheses from each phone number. c. Add a dash between the area code and the rest of the phone number. (.e. 789 123-4567 would become 789-123-4567) d. Change the zip+4 code in the heading from 4321 to 1234. The zip+4 is the last 4 digits of the zip code after the dash. e. Change Lois' last name from Lane to Kent, since she became married. 1. Change Lane in the addresses to in 2. Transposition (ie., rearrange the order of individual characters a. Swap the area code and exchange for the phone number in the body of the letter 3. Substitution (i.e., replace characters by other characters): a. Substitute # for to correct a type where were used instead of and change toto correct the typos in the addresses 4. Append extra data: a. Append a p.s. clause after the signature (the end of the letter). It should P.5. your winnings must be claimed by February 29th. read a. Substitute # for '@' to correct a type where @ were used instead of # and change;' to, to correct the typos in the addresses. 4. Append extra data: a. Append a p.s. clause after the signature (the end of the letter). It should read p.s. your winnings must be claimed by February 29th. In the example, your sed script should print the following: $ sed - -f minori.sed letter.txt ABC Corp 1234 7 Oaks In Denton, TX 76509-1234 800-543-7890 February 7th, 2021 Ms. Sue Jones 1515 Mockingbird in Apartment #701 Denton, TX 76509 Dear Mrs. Jones, This letter is to inform you that you have won the super coder contest. To claim your winnings, you may visit our office or call our claim hotline 817-654-4321. Mention your claim number #687. Sincerely, Lois Kent p.s. your winnings must be claimed by February 29th