Task 9. Your Own Validation Rule. Done

app/Rules/Uppercase.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Rules;
+
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Support\Str;
+
+class Uppercase implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (Str::ucfirst($value) !== $value) {
+            $fail('The :attribute does not start with an uppercased letter');
+        }
+    }
+}