refactor: re-organize code

lib/Player.cpp

@@ -0,0 +1,19 @@
+#include "Player.h";
+
+Player::Player(Vector2u screenSize): _screenWidth(screenSize.x) {
+	_shape = CircleShape(40, 3);
+	_shape.setFillColor(Color(52, 252, 5));
+	_shape.setPosition(_screenWidth / 2.f, screenSize.y - _shape.getScale().y - 50);
+}
+
+void Player::move(int direction) {
+	float max = _screenWidth - (_shape.getRadius() * 2);
+	float result = 5 * direction;
+
+	// Prevent leaving the window
+	if (_shape.getPosition().x + result < 0 || _shape.getPosition().x + result > max) {
+		result = 0;
+	}
+
+	_shape.move(result, 0);
+}