add 2 ts medium challenges

Author: diaz-rodrigo

Languages/Typescript/Generics/00529-medium-absolute.ts

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+/*
+  529 - Absolute
+  -------
+  by Andrey Krasovsky (@bre30kra69cs) #medium #math #template-literal
+
+  ### Question
+
+  Implement the `Absolute` type. A type that take string, number or bigint. The output should be a positive number string
+
+  For example
+
+  ```ts
+  type Test = -100;
+  type Result = Absolute<Test>; // expected to be "100"
+  ```
+
+  > View on GitHub: https://tsch.js.org/529
+*/
+
+/* _____________ Your Code Here _____________ */
+// my try
+type Absolute<T extends number | string | bigint> = T extends string
+  ? T extends `${infer H}${infer R}`
+    ? H extends "-"
+      ? `${R}`
+      : `${T}`
+    : `${T}`
+  : Absolute<`${T}`>;
+
+// shortest offical answer
+type AbsoluteOfficial<T extends number | string | bigint> =
+  `${T}` extends `-${infer R}` ? `${R}` : `${T}`;
+
+type Test = -5;
+type Result = Absolute<Test>; // expected to be "100"
+/* _____________ Test Cases _____________ */
+import type { Equal, Expect } from "@type-challenges/utils";
+
+type cases = [
+  Expect<Equal<Absolute<0>, "0">>,
+  Expect<Equal<Absolute<-0>, "0">>,
+  Expect<Equal<Absolute<10>, "10">>,
+  Expect<Equal<Absolute<-5>, "5">>,
+  Expect<Equal<Absolute<"0">, "0">>,
+  Expect<Equal<Absolute<"-0">, "0">>,
+  Expect<Equal<Absolute<"10">, "10">>,
+  Expect<Equal<Absolute<"-5">, "5">>,
+  Expect<Equal<Absolute<-1_000_000n>, "1000000">>,
+  Expect<Equal<Absolute<9_999n>, "9999">>
+];
+
+/* _____________ Further Steps _____________ */
+/*
+  > Share your solutions: https://tsch.js.org/529/answer
+  > View solutions: https://tsch.js.org/529/solutions
+  > More Challenges: https://tsch.js.org
+*/

Languages/Typescript/Generics/00531-medium-string-to-union.ts

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+/*
+  531 - String to Union
+  -------
+  by Andrey Krasovsky (@bre30kra69cs) #medium #union #string
+
+  ### Question
+
+  Implement the String to Union type. Type take string argument. The output should be a union of input letters
+
+  For example
+
+  ```ts
+  type Test = '123';
+  type Result = StringToUnion<Test>; // expected to be "1" | "2" | "3"
+  ```
+
+  > View on GitHub: https://tsch.js.org/531
+*/
+
+/* _____________ Your Code Here _____________ */
+
+type StringToUnion<T extends string> = T extends ""
+  ? never
+  : T extends `${infer R}${infer K}`
+  ? R | StringToUnion<K>
+  : never;
+
+type Test = "123";
+type Result = StringToUnion<Test>; // expected to be "1" | "2" | "3"
+
+/* _____________ Test Cases _____________ */
+import type { Equal, Expect } from "@type-challenges/utils";
+
+type cases = [
+  Expect<Equal<StringToUnion<"">, never>>,
+  Expect<Equal<StringToUnion<"t">, "t">>,
+  Expect<Equal<StringToUnion<"hello">, "h" | "e" | "l" | "l" | "o">>,
+  Expect<
+    Equal<
+      StringToUnion<"coronavirus">,
+      "c" | "o" | "r" | "o" | "n" | "a" | "v" | "i" | "r" | "u" | "s"
+    >
+  >
+];
+
+/* _____________ Further Steps _____________ */
+/*
+  > Share your solutions: https://tsch.js.org/531/answer
+  > View solutions: https://tsch.js.org/531/solutions
+  > More Challenges: https://tsch.js.org
+*/