add (solution): add swap_ptr task

Author: VaryVA

02_week/tasks/swap_ptr/swap_ptr.cpp

@@ -1,6 +1,8 @@
 #include <stdexcept>
 
-
-void SwapPtr(/* write arguments here */) {
-    throw std::runtime_error{"Not implemented"};
-}
+template<typename T>
+void SwapPtr(T& ptr1, T& ptr2) {
+    T temp = ptr1;
+    ptr1 = ptr2;
+    ptr2 = temp;
+}