function insertDashes(arr) {
    // write code here
    const lettersArray = arr.split("")
    const result = []
    let aux = ""
       
    for( let i=0; i<lettersArray.length; i++) {
        
        if( lettersArray[i+1] !== " " && lettersArray[i] !== " " && lettersArray[i+1] !== undefined) {
            aux = aux.concat(lettersArray[i] + "-")
        } else {
            aux = aux.concat(lettersArray[i])
        }
    }
    
    return (aux)
   
}



/**
* 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");
    });
});