fix code format

- fixes error in CI

solve/src/include/ae108/solve/GeneralizedNonlinearSolver.h

@@ -102,9 +102,9 @@ public:
    * Optimization", Cambridge University Press, 2019, pp. 531-534. PETSc's
    * nonlinear solver is used to solve the adapted system.
    *
-   * This method is also widely known as Lagrange Multiplier Method; 
-   * see Cook, R. D., Malkus, D. S., Plesha, M. E. & Witt, 
-   * R. J. Concepts and Applications of Finite Element Analysis, 
+   * This method is also widely known as Lagrange Multiplier Method;
+   * see Cook, R. D., Malkus, D. S., Plesha, M. E. & Witt,
+   * R. J. Concepts and Applications of Finite Element Analysis,
    * 4th Edition. (Wiley, 2001).
    *
    * @param boundaryConditions The generalized boundary conditions.