Bugfix ISBN validation & trimming for API

UniRegensburg / unsere-app-fur-die-universitat-regensburg-bib-buddy

Bib Buddy - deine App für eine konzentrierte, offene Literaturarbeit!

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Closed LuisMossburger closed 3 years ago

LuisMossburger commented 3 years ago

Description Closes #133. Adds proper validation and trimming of ISBNs before sending it to API & respective error message.

Affects Classes relating to ISBN retrieval.

Notes for Reviewer Please review & comment/approve.

LuisMossburger commented 3 years ago

Thanks for the review, corrected everything as suggested!