fixed FileNotFoundError

#11

I got this error when using this dataset:
FileNotFoundError: Couldn't find file at https://ftp.ncbi.nlm.nih.gov/genomes/refseq/bacteria/Bacteroides_acidifaciens/latest_assembly_versions/GCF_000944395.1_1e8A_assembly/GCF_000944395.1_1e8A_assembly_genomic.fna.gz

so I added two functions to validate the urls before downloading them

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