Reverse Words in a String

Given an input string s, reverse the order of the words.

A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space.

Return a string of the words in reverse order concatenated by a single space.

Note: The input string may contain leading or trailing spaces or multiple spaces between words. The returned string should only have a single space separating the words and no extra spaces.

Example Inputs & Outputs

// Example 1:
Input: s = "the sky is blue"
Output: "blue is sky the"

// Example 2:
Input: s = "  hello world  "
Output: "world hello"
Explanation: Your reversed string should not contain leading or trailing spaces.

// Example 3:
Input: s = "a good   example"
Output: "example good a"
Explanation: You need to reduce multiple spaces between two words to a single space in the reversed string.

Constraints & Edge Cases

• 1 <= s.length <= 10^4
• s contains English letters (upper-case and lower-case), digits, and spaces ' '.
• There is at least one word in s.
• Empty string or string with only spaces should return an empty string.
• Single word should return the word itself.
• Multiple spaces between words should be reduced to a single space in the output.