feat(content): function signatures + test cases

backend/data/questions/check-if-string-is-a-prefix-of-array.yaml

@@ -9,6 +9,24 @@ categories:
 patterns:
   - two-pointers
 
+function_signature: "def is_prefix_string(s: str, words: list[str]) -> bool:"
+
+test_cases:
+  visible:
+    - input: { s: "iloveleetcode", words: ["i", "love", "leetcode", "apples"] }
+      expected: true
+    - input: { s: "iloveleetcode", words: ["apples", "i", "love", "leetcode"] }
+      expected: false
+  hidden:
+    - input: { s: "a", words: ["a", "b"] }
+      expected: true
+    - input: { s: "abc", words: ["abc"] }
+      expected: true
+    - input: { s: "ab", words: ["a", "bc"] }
+      expected: false
+    - input: { s: "abc", words: ["ab", "c", "d"] }
+      expected: true
+
 description: |
   Given a string `s` and an array of strings `words`, determine whether `s` is a **prefix string** of `words`.