feat(leetcode): add No.2000

Author: mickey0524

2000.Reverse-Prefix-of-Word.java

@@ -0,0 +1,32 @@
+// https://leetcode.com/problems/reverse-prefix-of-word/
+// algorithms
+// Easy (80.9%)
+// Total Accepted: 7.2K
+// Total Submissions: 8.9K
+
+
+class Solution {
+    public String reversePrefix(String word, char ch) {
+        int idx = -1;
+        int len = word.length();
+        
+        for (int i = 0; i < len; i++) {
+            if (word.charAt(i) == ch) {
+                idx = i;
+                break;
+            }
+        }
+        
+        if (idx != -1) {
+            StringBuilder sb = new StringBuilder();
+            for (int i = idx; i >= 0; i--) {
+                sb.append(word.charAt(i));
+            }
+            sb.append(word.substring(idx + 1));
+            
+            return sb.toString();
+        }
+        
+        return word;
+    }
+}