Reverse the character array `s` in-place and return it. Variant **#36**.
Example 1
Input: s = ["v","a","r","i","a","n","t","3","6","c","o","d","e"]
Output: ["e","d","o","c","6","3","t","n","a","i","r","a","v"]
Constraints
Acceptance: 64% · Topics: string, two-pointers