1. implement Partial<T>

Partial<T> returns a type whichs represents all subsets of type T.

Please implement MyPartial<T> by yourself.

type Foo = {  a: string  b: number  c: boolean}// below are all validconst a: MyPartial<Foo> = {}const b: MyPartial<Foo> = {  a: 'BFE.dev'}const c: MyPartial<Foo> = {  b: 123}const d: MyPartial<Foo> = {  b: 123,  c: true}const e: MyPartial<Foo> = {  a: 'BFE.dev',  b: 123,  c: true}