function insertDashes(arr) {
    // 1. split string into array of substrings based on space delimiter
    const substringsArr = arr.split(" ");
    
    // 2. for each substring
    for (let i= 0; i<substringsArr.length; i++){
        // a. split into array of characters
        // b. create new substring by joining with "-"
        // c. update array with new substring result
        substringsArr[i] = substringsArr[i].split("").join("-");
    }
    // 3. create and return result string by joining result substrings with " "
    return substringsArr.join(" ");
}



/**
* Test Suite 
*/
describe('insertDashes()', () => {
    it('insert dashes in between chars', () => {
        // arrange
        const value = "aba caba";
        
        // act
        const result = insertDashes(value);

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe("a-b-a c-a-b-a");
    });
});