
Reverse the characters of a string and return the reversed result. Avoid built-in reverse helpers and target a linear-time solution.
s = "hello"Output"olleh"WhyCharacters appear in the opposite order.s = "Autodesk"Output"ksedotuA"WhyThe string is reversed from end to start.`0 <= len(s) <= 10^5``s` may contain letters, digits, spaces, and punctuationReturn the reversed string exactly