Fix/backend/check in

[Rethakgetse-Manaka]

Description

Check in has been fixed. Refactoring has been done to book room along with a validator

Fixes # (issue)

Type of change

Function update

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.15%. Comparing base (4d4a507) to head (2811dfe).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #80   +/-   ##
========================================
  Coverage    82.15%   82.15%           
========================================
  Files            5        5           
  Lines          241      241           
========================================
  Hits           198      198           
  Misses          34       34           
  Partials         9        9           

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