diff --git a/example/ex10.cpp b/example/ex10.cpp
index a17478f..30dd1d8 100644
--- a/example/ex10.cpp
+++ b/example/ex10.cpp
@@ -25,11 +25,11 @@
  * Also add information on how to contact you by electronic and paper mail.
  ******************************************************/
 
+#include <iostream>
+#include <iomanip>
+#include "../lib/optimization.h"
 #include "gctl/core.h"
 #include "gctl/algorithms.h"
-#include "../lib/optimization.h"
-#include "iostream"
-#include "iomanip"
 
 using std::cout;
 using std::endl;
diff --git a/example/ex4.cpp b/example/ex4.cpp
index 10ef0ed..bd0fdee 100644
--- a/example/ex4.cpp
+++ b/example/ex4.cpp
@@ -25,11 +25,11 @@
  * Also add information on how to contact you by electronic and paper mail.
  ******************************************************/
 
+#include <iostream>
+#include <iomanip>
+#include "../lib/optimization.h"
 #include "gctl/core.h"
 #include "gctl/algorithms.h"
-#include "../lib/optimization.h"
-#include "iostream"
-#include "iomanip"
 
 using std::cout;
 using std::endl;
diff --git a/example/ex5.cpp b/example/ex5.cpp
index dc55069..b195f9c 100644
--- a/example/ex5.cpp
+++ b/example/ex5.cpp
@@ -25,9 +25,9 @@
  * Also add information on how to contact you by electronic and paper mail.
  ******************************************************/
 
+#include "../lib/optimization.h"
 #include "gctl/core.h"
 #include "gctl/algorithms.h"
-#include "../lib/optimization.h"
 
 int main(int argc, char const *argv[])
 {
diff --git a/example/ex6.cpp b/example/ex6.cpp
index ca4e0fd..8a020b6 100644
--- a/example/ex6.cpp
+++ b/example/ex6.cpp
@@ -25,9 +25,9 @@
  * Also add information on how to contact you by electronic and paper mail.
  ******************************************************/
 
+#include "../lib/optimization.h"
 #include "gctl/core.h"
 #include "gctl/algorithms.h"
-#include "../lib/optimization.h"
 
 // get random floating points
 double random_double(double l, double t)
diff --git a/example/ex7.cpp b/example/ex7.cpp
index 3bc7830..c18d73b 100644
--- a/example/ex7.cpp
+++ b/example/ex7.cpp
@@ -25,9 +25,9 @@
  * Also add information on how to contact you by electronic and paper mail.
  ******************************************************/
 
+#include "../lib/optimization.h"
 #include "gctl/core.h"
 #include "gctl/algorithms.h"
-#include "../lib/optimization.h"
 
 typedef gctl::array<std::complex<double>> cd_array;
 
diff --git a/example/ex8.cpp b/example/ex8.cpp
index e1f3b44..fc7d11d 100644
--- a/example/ex8.cpp
+++ b/example/ex8.cpp
@@ -25,9 +25,9 @@
  * Also add information on how to contact you by electronic and paper mail.
  ******************************************************/
 
+#include "../lib/optimization.h"
 #include "gctl/core.h"
 #include "gctl/algorithms.h"
-#include "../lib/optimization.h"
 
 #define M 1000
 #define N 900
diff --git a/lib/optimization/cholesky.h b/lib/optimization/cholesky.h
index 15c1881..5a05574 100644
--- a/lib/optimization/cholesky.h
+++ b/lib/optimization/cholesky.h
@@ -50,6 +50,6 @@ namespace gctl
         void operator=(const gctl::cholesky&) = delete;
         matrix<double> &decomposedMatrix;
     };
-}
+};
 
 #endif // _CHOLESKY_H
\ No newline at end of file
diff --git a/lib/optimization/clcg.h b/lib/optimization/clcg.h
index 9d04336..dabb5ff 100644
--- a/lib/optimization/clcg.h
+++ b/lib/optimization/clcg.h
@@ -184,6 +184,6 @@ namespace gctl
         void clbicgstab(array<std::complex<double> > &m, const array<std::complex<double> > &B, std::ostream &ss = std::clog);
         void cltfqmr(array<std::complex<double> > &m, const array<std::complex<double> > &B, std::ostream &ss = std::clog);
     };
-}
+};
 
 #endif // _GCTL_CLCG_H
\ No newline at end of file
diff --git a/lib/optimization/dwa.h b/lib/optimization/dwa.h
index ddcb39e..db73693 100644
--- a/lib/optimization/dwa.h
+++ b/lib/optimization/dwa.h
@@ -109,6 +109,6 @@ namespace gctl
          */
         void get_records(array<double> &logs);
     };
-}
+};
 
 #endif // _GCTL_DWA_H
\ No newline at end of file
diff --git a/lib/optimization/gradnorm.h b/lib/optimization/gradnorm.h
index afd6ffa..25cc10c 100644
--- a/lib/optimization/gradnorm.h
+++ b/lib/optimization/gradnorm.h
@@ -154,6 +154,6 @@ namespace gctl
          */
         void save_records(std::string file);
     };
-}
+};
 
 #endif // _GCTL_GRADNORM_H
\ No newline at end of file
diff --git a/lib/optimization/lbfgs.h b/lib/optimization/lbfgs.h
index e944130..7b35850 100644
--- a/lib/optimization/lbfgs.h
+++ b/lib/optimization/lbfgs.h
@@ -554,6 +554,6 @@ namespace gctl
          */
         double LBFGS_MinimizePreconditioned(array<double> &m, std::ostream &ss = std::clog, bool err_throw = false);
     };
-}
+};
 
 #endif // _GCTL_LBFGS_H
\ No newline at end of file
diff --git a/lib/optimization/lcg.h b/lib/optimization/lcg.h
index 8ba6423..20212f6 100644
--- a/lib/optimization/lcg.h
+++ b/lib/optimization/lcg.h
@@ -385,6 +385,6 @@ namespace gctl
 		 */
 		void lspg(array<double> &m, const array<double> &B, const array<double> &low, const array<double> &hig, std::ostream &ss = std::clog);
 	};
-}
+};
 
 #endif // _GCTL_LCG_H
\ No newline at end of file
diff --git a/lib/optimization/lgd.h b/lib/optimization/lgd.h
index b3d8fe4..32af33c 100644
--- a/lib/optimization/lgd.h
+++ b/lib/optimization/lgd.h
@@ -287,6 +287,6 @@ namespace gctl
         bool lgd_silent_, lgd_has_range_, lgd_has_alpha_, lgd_save_trace_;
         array<double> lgd_low_, lgd_hig_, lgd_alpha_, lgd_trace_;
     };
-}
+};
 
 #endif // _GCTL_LGD_H
\ No newline at end of file
diff --git a/lib/optimization/loss_func.h b/lib/optimization/loss_func.h
index a448212..0614536 100644
--- a/lib/optimization/loss_func.h
+++ b/lib/optimization/loss_func.h
@@ -120,6 +120,6 @@ namespace gctl
         array<double> tars_, diff_;
         array<double> us_;
     };
-}
+};
 
 #endif // _GCTL_LOSS_FUNC_H
\ No newline at end of file
diff --git a/lib/optimization/lu.h b/lib/optimization/lu.h
index a963fe5..fb33b77 100644
--- a/lib/optimization/lu.h
+++ b/lib/optimization/lu.h
@@ -51,6 +51,6 @@ namespace gctl
         matrix<double> &decomposedMatrix; // Output matrix after decomposition
         array<int> rowPermutation; // Permutation of rows during pivoting
     };
-}
+};
 
 #endif // _GCTL_LU_H
\ No newline at end of file
diff --git a/lib/optimization/sgd.h b/lib/optimization/sgd.h
index 8e699ea..0fd2607 100644
--- a/lib/optimization/sgd.h
+++ b/lib/optimization/sgd.h
@@ -196,6 +196,6 @@ namespace gctl
 
         void SGD_Minimize(array<double> &m, sgd_solver_type solver_id = ADAM, std::ostream &ss = std::clog, bool verbose = true, bool err_throw = false);
     };
-}
+};
 
 #endif // _GCTL_SGD_H
\ No newline at end of file
diff --git a/lib/optimization/svd.h b/lib/optimization/svd.h
index 8523ade..0537cdf 100644
--- a/lib/optimization/svd.h
+++ b/lib/optimization/svd.h
@@ -74,6 +74,6 @@ namespace gctl
         int maxi_iteration, K;
         double epsilon;
     };
-}
+};
 
 #endif // _GCTL_SVD_H
\ No newline at end of file