Fix Deprecated Warning for trim() on Null Values

[izzygld]

Fix Deprecated Warning for trim() on Null Values

Description

This issue tracks a PHP 8.1+ deprecation warning caused by passing null to trim() in the redirect() function. The error message is:

PHP Deprecated: trim(): Passing null to parameter ($string) of type string is deprecated

Steps to Reproduce

1. Use PHP 8.1 or later.
2. Activate the Simple 301 Redirects plugin.
3. Observe the deprecated warning in logs.

Proposed Fix

• Ensure that $userrequest and $storedrequest are cast to (string) before calling trim().
• A pull request has been created to fix this: #20.

Impact

• ✅ Eliminates the deprecation notice.
• ✅ Improves compatibility with newer PHP versions.

Related PR: #20