Delete Soldier class

Make Infantry as structure

include/Player.h

@@ -6,7 +6,7 @@
 class Player {
 private:
 	char name;
-	std::vector<std::unique_ptr<Soldier>> army;
+	std::vector<std::unique_ptr<Infantry>> army;
 	double score;
 public:
 	Player() {
@@ -15,7 +15,7 @@ public:
 			army.push_back(std::make_unique<Infantry>());
 		}
 	}
-	std::vector<std::unique_ptr<Soldier>>& get_army() {
+	std::vector<std::unique_ptr<Infantry>>& get_army() {
 		return army;
 	}
 };