Day 3 Exercise solution

[pirates-alert]

This is the pull request for the Merging day 3 exercise into master. the same was given last week .
Please review and merge the same
questions solved are as below

• longest-word-in-string
• rotated-string
• args-string
• telephone-check
• rot-13
• abbreviate-string
• add-big-integers

in the same order.

every solution includes a pseudo code as well as comments regarding the approach followed

I have tried to make the code as modular and abstract as possible . @ArfatSalman please review and let me know your opinion. I am up for some constructive criticism so all the remarks are welcome. Also @andrewlinfoot , @ahhda i would be really glad if you could guide me through the process.
Example of the Psudo code`/**

• Please be sincear and let me know about all the mistakes i have made
• please be a little kind as i am still a novoice and am still learning

•                                                          @Bhargav Mantha
  

• consider the example [ '539', '8', '201' ] in string literal format on convertion we get
• Procedure/Approach/psudo code i am following
• 1.Step one Split the string into specific numbers Strings based on \n =>[ '539', '8', '201' ]
• 2.now get the greatest length in the above array array => in the abpove case its 3
• 3. now add zeros to the places without the same for missing positions
• ex---[ '539', '008', '201' ]
• 4.now we generate a big number JSON with key as the units(0),once(1),tens(2) and so onn=>
• {
  '0': [ '2', '0', '5' ],
  '1': [ '0', '0', '3' ],
  '2': [ '1', '8', '9' ]
  }
• 5.now calculate the sume of each array
• 6.pass On the carry
• 7.reverse the array
• VOOOLAA we have the sum of big integers
• */`

references of the above are:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc

https://regex101.com/r/iZ2vL4/65

and ofcourse a lot of googeling and stack overflow