* fixed error and changed functions names
fixed error at line 57 and gave semantic names to functions with comments
* renamed functions
renamed functions to match with original functions' names in the file
* Updated TestCases
Updated TestCases and changed a function name
* Removed main() and changed function name
Removed main() and changed the function name from isPalindromeStringBuilder to isPalindrome
* fixed typo
Co-authored-by: Debasish Biswas <debasishbsws.abc@gmail.com>