fixed failing test cases

[sankarvj]

Fixed following test cases in golang server

Test 2: Expects results for the case-sensitive query.
The suffixarray package indexes the words as we passed. To ensure case insensitivity, I converted the entire doc to lowercase before passing it to the index function. Additionally, I converted the query string to lowercase before calling the lookup function to avoid any case-sensitive failures.

Test 3: Expects 20 results for the query drunk.
The suffixarray package returns the complete list of indexes it matches. To restrict the output to the first 20 results, I included a constant with a value of 20 and returned the subset if the indexes had more than 20 results.

Fixed following test cases in JS

Test 3: Expects load more to append results.To enable load more, I have received a page number from the client and implemented pagination logic on the server side. The page number will be reset when the client initiates a new search and will automatically increment each time the "load more" function is triggered.