[refactor] Seperate Test files, suites and cases with one expect call

[sarava338]

Need to do the following

Edit : Must solve the Issues in the following order

1. [chore] create seperate test files for each Data Structure #21
2. [refactor] create seperate Test Suite for each Algorithms for each Test files #22
3. [refactor] One test case should contain one expect call only #23