add: 检查单词是否为句中其他单词的前缀

test/string/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence.test.js

@@ -0,0 +1,5 @@
+import { isPrefixOfWord } from '../../src/string/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence'
+
+test('检查单词是否为句中其他单词的前缀', () => {
+  expect(isPrefixOfWord('i love eating burger', 'burg')).toBe(4)
+})