Fix 'A C# document may only contain a single class at the root level unless all of the classes are partial and are of the same type.' issue in src\Providers\MultiSms.Mutlucell.Provider\Models\MutlucellMessage.cs

[mustafagenc]

CodeFactor found an issue: A C# document may only contain a single class at the root level unless all of the classes are partial and are of the same type.

It's currently on:
src\Providers\MultiSms.Mutlucell.Provider\Models\MutlucellMessage.cs:16
Commit 23dab06