Fix: add custom URL validation to ShortenURL function #4
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This pull request includes , focusing on improving URL validation and handling custom URLs. The most important changes include switching the package declaration, adding a new function for custom URL validation, and modifying the URL shortening logic to incorporate this validation.
Improvements to URL validation and handling:
internal/api/v1/shorten.go: Added thevalidateCustomURLfunction to ensure custom URLs do not contain spaces or illegal characters.internal/api/v1/shorten.go: Modified theShortenURLfunction to use thevalidateCustomURLfunction and handle invalid custom URLs by returning aBadRequeststatus.