diff --git a/src/templates_front/templator_front.org b/src/templates_front/templator_front.org
index dc7867d..111184d 100644
--- a/src/templates_front/templator_front.org
+++ b/src/templates_front/templator_front.org
@@ -12,7 +12,6 @@
   #+end_src
 
   #+begin_src fortran :tangle prefix_fortran.f90 :noweb yes
-<<header>>
 
 module trexio
 
@@ -292,9 +291,9 @@ trexio_t* trexio_open(const char* file_name, const char mode, const back_end_t b
 interface
    type (c_ptr) function trexio_open (filename, mode, backend) bind(C)
      use, intrinsic :: iso_c_binding
-     character(kind=c_char), dimension(*)   :: filename
-     character(kind=c_char), intent(in)     :: mode
-     integer (c_int32_t), intent(in), value :: backend
+     character(kind=c_char), dimension(*)      :: filename
+     character(kind=c_char), intent(in), value :: mode
+     integer (c_int32_t), intent(in), value    :: backend
    end function trexio_open
 end interface   
    #+end_src
@@ -375,7 +374,7 @@ trexio_exit_code trexio_close(trexio_t* file) {
 
    #+begin_src fortran :tangle prefix_fortran.f90
 interface
-   type (c_int32_t) function trexio_close (trex_file) bind(C)
+   integer (c_int32_t) function trexio_close (trex_file) bind(C)
      use, intrinsic :: iso_c_binding
      type (c_ptr), intent(in), value :: trex_file
    end function trexio_close
@@ -469,7 +468,7 @@ interface
    integer (c_int32_t) function trexio_read_$group_num$ (trex_file, num) bind(C)
      use, intrinsic :: iso_c_binding
      type (c_ptr), intent(in), value :: trex_file
-     integer (c_int64_t), intent(inout), value :: num
+     integer (c_int64_t), value :: num
    end function trexio_read_$group_num$
 end interface
 
diff --git a/src/test.f90 b/src/test.f90
new file mode 100644
index 0000000..3e44ab8
--- /dev/null
+++ b/src/test.f90
@@ -0,0 +1,24 @@
+program test_trexio
+
+  use trexio
+
+  implicit none
+
+  type(c_ptr) :: file1
+
+  integer :: rc 
+  integer (c_int64_t) :: num 
+
+  rc = 0
+  num = 10
+
+  file1 = trexio_open('test_fort' // c_null_char, 'w', 1)
+!  file1 = trexio_open('test_fort.h5' // c_null_char, 'w', 0)
+
+  rc = trexio_write_nucleus_num(file1, num)
+  if (rc == 0) write(*,*) 'SUCCESS 1'
+
+  rc = trexio_close(file1)
+  if (rc == 0) write(*,*) 'SUCCESS 2' 
+
+end program test_trexio