Reverse the character array `s` in-place and return it. Variant **#46**.
Example 1
Input: s = ["v","a","r","i","a","n","t","4","6","c","o","d","e"]
Output: ["e","d","o","c","6","4","t","n","a","i","r","a","v"]
Constraints
Acceptance: 74% · Topics: string, two-pointers