feat(work): add Go solution stub for first unique character and remove outdated JS files

work/Easy/Hash Table/387.first-unique-character-in-a-string.go

@@ -0,0 +1,47 @@
+/*
+ * 387. First Unique Character in a String
+ * Difficulty: Easy
+ * https://leetcode.com/problems/first-unique-character-in-a-string/
+ * 
+ * ──────────────────────────────────────────────────
+ * 
+ * Given a string s, find the first non-repeating character in it and
+ * return its index. If it does not exist, return -1.
+ * 
+ *  
+ * 
+ * Example 1:
+ * 
+ * Input: s = "leetcode"
+ * 
+ * Output: 0
+ * 
+ * Explanation:
+ * 
+ * The character 'l' at index 0 is the first character that does not
+ * occur at any other index.
+ * 
+ * Example 2:
+ * 
+ * Input: s = "loveleetcode"
+ * 
+ * Output: 2
+ * 
+ * Example 3:
+ * 
+ * Input: s = "aabb"
+ * 
+ * Output: -1
+ * 
+ *  
+ * 
+ * Constraints:
+ * 
+ * 	• 1 <= s.length <= 10^5
+ * 
+ * 	• s consists of only lowercase English letters.
+*/
+
+func firstUniqChar(s string) int {
+    
+}