02688-medium-startswith.ts

// ============= Test Cases =============
import type { Equal, Expect } from './test-utils'
import { ExpectFalse, NotEqual } from './test-utils'

type cases = [
  Expect<Equal<StartsWith<'abc', 'ac'>, false>>,
  Expect<Equal<StartsWith<'abc', 'ab'>, true>>,
  Expect<Equal<StartsWith<'abc', 'abcd'>, false>>,
]


// ============= Your Code Here =============
type StartsWith<T extends string, U extends string> = T extends `${U}${infer R}` ? true: false