How to extract Genbank sequence and identify ORFs from the sequence in R?

I used

ape::read.GenBank

and then used the function

ORFik::findORFs

to find ORFs in the sequence of interest. But the former one results in a DNAbin class format and the latter one requires FASTA format.

Is there a function available to convert the sequence from DNAbin class format to FASTA format?

(I could think of directly downloading the FASTA format file and use the function.)