Resolve Racon Conflict with Numeric Named Reads

[ad3002]

This pull request addresses an open issue in Racon (https://github.com/isovic/racon/issues/233), where Racon encounters an error if reads and contigs have identical names. In our project, we have read files with numeric names generated by an upstream tool, leading to a naming conflict in Racon.

To resolve this, I have implemented a solution where a 'unitig' prefix is added to unitig fasta records. This change effectively prevents the name conflict in Racon, and subsequent tests confirm that RNA-Bloom now operates as expected. This update ensures compatibility and stability in RNA-Bloom, addressing the named issue without affecting other functionalities.