Fix code style issues in mars, newtons_law_test, and solar_system demos to pass repository-check/code-style workflow

Author: sportokalidis

demo/mars/src/CelestialObjects.h

@@ -28,12 +28,12 @@ class CelestialObject : public Cell {
   // constructors
   CelestialObject() { UpdateVolume(); }
 
-  explicit CelestialObject(real_t diameter){
+  explicit CelestialObject(real_t diameter) {
     this->SetDiameter(diameter);
     UpdateVolume();
   }
 
-  explicit CelestialObject(const Real3& position){
+  explicit CelestialObject(const Real3& position) {
     this->SetPosition(position);
     UpdateVolume();
   }

demo/newtons_law_test/src/CelestialObjects.h

@@ -28,12 +28,12 @@ class CelestialObject : public Cell {
   // constructors
   CelestialObject() { UpdateVolume(); }
 
-  explicit CelestialObject(real_t diameter){
+  explicit CelestialObject(real_t diameter) {
     this->SetDiameter(diameter);
     UpdateVolume();
   }
 
-  explicit CelestialObject(const Real3& position){
+  explicit CelestialObject(const Real3& position) {
     this->SetPosition(position);
     UpdateVolume();
   }

demo/solar_system/src/CelestialObjects.h

@@ -28,12 +28,12 @@ class CelestialObject : public Cell {
   // constructors
   CelestialObject() { UpdateVolume(); }
 
-  explicit CelestialObject(real_t diameter){
+  explicit CelestialObject(real_t diameter) {
     this->SetDiameter(diameter);
     UpdateVolume();
   }
 
-  explicit CelestialObject(const Real3& position){
+  explicit CelestialObject(const Real3& position) {
     this->SetPosition(position);
     UpdateVolume();
   }