// Valid Anagram — EASY
// Category: string
Given two strings `s` and `t`, return `true` if `t` is an anagram of `s`, and `false` otherwise.
An **anagram** is a word formed by rearranging the letters of another, using all original letters exactly once.
**Constraints:**
- `1 <= s.length, t.length <= 5 × 10⁴`
Example: s = "anagram", t = "nagaram"
Output: true