Function backspace

src/app/components/code/code.component.ts:118–122

()

    }

    backspace() {
        if (this.loading) return;
        const code = this.code$.value;
        this.code$.next(code.substring(0, code.length - 1));
    }

    observeAsterisk(a: Element, i: number) {
        this.code$.subscribe(code => {