feat(content): function signatures + test cases

backend/data/questions/valid-palindrome-ii.yaml

@@ -9,6 +9,28 @@ categories:
 patterns:
   - two-pointers
 
+function_signature: "def valid_palindrome(s: str) -> bool:"
+
+test_cases:
+  visible:
+    - input: { s: "aba" }
+      expected: true
+    - input: { s: "abca" }
+      expected: true
+    - input: { s: "abc" }
+      expected: false
+  hidden:
+    - input: { s: "a" }
+      expected: true
+    - input: { s: "aa" }
+      expected: true
+    - input: { s: "ab" }
+      expected: true
+    - input: { s: "racecar" }
+      expected: true
+    - input: { s: "racecars" }
+      expected: true
+
 description: |
   Given a string `s`, return `true` *if the* `s` *can be a palindrome after deleting **at most one** character from it*.