text: import { FETCH_POSTS, FETCH_POST } from '../actions/index';
  const INITIAL_STATE = { all: [], post: null };
  
  export default function (state = INITIAL_STATE, action) {
      switch (action.type) {
          case FETCH_POST: 
              return {...state, post: action.payload.data};
          case FETCH_POSTS:
              return {...state, all: action.payload.data};
          default:
              return state;
      }
  }