Es el último trabajo que te toma Javascript, no sé porque me da error si el resultado es el mismo que pide. Me dice "No input"

Question

https://code.sololearn.com/WnxjECpjcfLI/?ref=app

Answer 1

Very close

At line 4

No need the space

Just initialize as empty string.

this.str ="";

Answer 2

I can't believe you, thank You 👏🏼💪🏼