feat: add phone number validation to Student class and enforce format checks

lab2/main.rb

@@ -1,5 +1,6 @@
 require_relative 'student'
 
+begin
     student1 = Student.new(
         surname: 'Алексеевич',
         name: 'Артем-Дариус',
@@ -20,3 +21,7 @@ student2 = Student.new(
     puts student1
     puts '-' * 40
     puts student2 
+rescue ArgumentError => e
+    puts "Err.: #{e.message}"
+end
+

lab2/student.rb

@@ -1,14 +1,22 @@
 class Student
     attr_accessor :id, :surname, :name, :patronymic, :phone, :telegram, :email, :git
 
+    def self.valid_phone_number?(phone)
+        phone.match?(/\A\+?[0-9]{10,15}\z/)
+    end
+
     def initialize(args = {})
         @surname = args.fetch(:surname)
         @name = args.fetch(:name)
         @patronymic = args.fetch(:patronymic)
 
-
         @id = args[:id] || nil
-        @phone = args[:phone] || nil
+
+        @phone = args[:phone]
+        if @phone && !Student.valid_phone_number?(@phone)
+            raise ArgumentError, "Invalid phone number format: #{@phone}"
+        end
+        
         @telegram = args[:telegram] || nil
         @email = args[:email] || nil
         @git = args[:git] || nil