The next problem is that you are using backslashes which act as an escape character. You can get around this by declaring your string as “raw”:
let art= String.raw`Here’s some ASCII art:
_______
/ \
| ___ |
| |___| |
| |
\______ /
|
[=========]
| | | |
/ | \ /
/_____|_____\|
And here’s some more text. `;