Make strings non-nullable by using different variables to just check input

Lesson_2/Task_1/Program.cs

@@ -10,17 +10,21 @@ List<Product> products = new List<Product>();
 
 for (int i = 0; i < 10; i++)
 {
-    string? name;
+    string name;
     float price;
 
     while (true)
     {
         Console.Write($"Enter product {i + 1} name: ");
-        name = Console.ReadLine();
+        string? input = Console.ReadLine();
-        if (name != null)
+        if (!string.IsNullOrEmpty(input))
+        {
+            name = input;
             break;
+        }
     }
 
+
     while (true)
     {
         Console.Write($"Enter product {i + 1} price: ");

Lesson_2/Task_3/Program.cs

@@ -20,14 +20,17 @@ List<Customer> customers = new List<Customer>()
     new Customer("Alex", 77, "Street 10")
 };
 
-string? name;
+string name;
 
 while (true)
 {
     Console.Write("Enter name: ");
-    name = Console.ReadLine();
+    string? input = Console.ReadLine();
-    if (name != null)
+    if (!string.IsNullOrEmpty(input))
+    {
+        name = input;
         break;
+    }
 }
 
 var selected = from customer in customers where customer.Name == name select customer;

Lesson_2/Task_4/Program.cs

@@ -21,14 +21,17 @@ List<Car> cars = new List<Car>()
     new Car("789GHI", 3),
 };
 
-string? number;
+string number;
 
 while (true)
 {
     Console.Write("Enter number: ");
-    number = Console.ReadLine();
+    string? input = Console.ReadLine();
-    if (number != null)
+    if (!string.IsNullOrEmpty(input))
+    {
+        number = input;
         break;
+    }
 }
 
 var selected = owners.FirstOrDefault(owner => cars.Any(car => car.Number == number && car.OwnerId == owner.Id));