add: 最长公共前缀

test/string/longest-common-prefix.test.js

@@ -0,0 +1,8 @@
+import { longestCommonPrefix } from '../../src/string/longest-common-prefix'
+
+test('最长公共前缀', () => {
+  expect(longestCommonPrefix(['flower', 'flow', 'flight'])).toBe('fl')
+  expect(longestCommonPrefix(['dog', 'racecar', 'car'])).toBe('')
+  expect(longestCommonPrefix(['a'])).toBe('a')
+  expect(longestCommonPrefix(['caa', '', 'a', 'acb'])).toBe('')
+})