fix(utils): address memory leaks in CharacterStringType, Idm

src/Utilities/CharString.f90

@@ -31,6 +31,7 @@ module CharacterStringModule
     procedure :: charstring_eq_charstring
     procedure :: write_unformatted
     procedure :: strlen
+    procedure :: destroy
     generic :: assignment(=) => assign_to_charstring, assign_from_charstring
     generic :: operator(==) => character_eq_charstring, &
       charstring_eq_character, &
@@ -127,4 +128,9 @@ function strlen(this) result(length)
     end if
   end function strlen
 
+  subroutine destroy(this)
+    class(CharacterStringType), intent(inout) :: this
+    if (allocated(this%charstring)) deallocate (this%charstring)
+  end subroutine destroy
+
 end module CharacterStringModule

src/Utilities/Idm/mf6blockfile/Mf6FileGridInput.f90

@@ -219,7 +219,11 @@ end subroutine bndgrid_rp
 
   subroutine bndgrid_destroy(this)
     class(BoundGridInputType), intent(inout) :: this !< Mf6FileGridInputType
+    !
+    ! deallocate tasmanager
+    call this%tasmanager%da()
     deallocate (this%tasmanager)
+    nullify (this%tasmanager)
   end subroutine bndgrid_destroy
 
   subroutine bndgrid_reset(this)

src/Utilities/Idm/mf6blockfile/Mf6FileListInput.f90

@@ -169,7 +169,13 @@ end subroutine bndlist_rp
 
   subroutine bndlist_destroy(this)
     class(BoundListInputType), intent(inout) :: this !< BoundListInputType
+    !
+    ! deallocate tsmanager
+    call this%tsmanager%da()
     deallocate (this%tsmanager)
+    nullify (this%tsmanager)
+    !
+    ! deallocate StructArray
     call destructStructArray(this%structarray)
     call this%bound_context%destroy()
   end subroutine bndlist_destroy

src/Utilities/Idm/mf6blockfile/StructArray.f90

@@ -481,6 +481,7 @@ subroutine load_deferred_vector(this, icol)
                           this%mempath)
         do i = 1, this%nrow
           p_charstr1d(i) = this%struct_vectors(icol)%charstr1d(i)
+          call this%struct_vectors(icol)%charstr1d(i)%destroy()
         end do
       end if
 
@@ -668,6 +669,7 @@ subroutine check_reallocate(this)
 
           do i = 1, this%struct_vectors(j)%size
             p_charstr1d(i) = this%struct_vectors(j)%charstr1d(i)
+            call this%struct_vectors(j)%charstr1d(i)%destroy()
           end do
 
           deallocate (this%struct_vectors(j)%charstr1d)

src/Utilities/Memory/Memory.f90

@@ -99,6 +99,7 @@ end function mt_associated
 
   subroutine mt_deallocate(this)
     class(MemoryType) :: this
+    integer(I4B) :: n
 
     if (associated(this%strsclr)) then
       if (this%master) deallocate (this%strsclr)
@@ -156,7 +157,12 @@ subroutine mt_deallocate(this)
     end if
 
     if (associated(this%acharstr1d)) then
-      if (this%master) deallocate (this%acharstr1d)
+      if (this%master) then
+        do n = 1, size(this%acharstr1d)
+          call this%acharstr1d(n)%destroy()
+        end do
+        deallocate (this%acharstr1d)
+      end if
       nullify (this%acharstr1d)
     end if
   end subroutine mt_deallocate

src/Utilities/Memory/MemoryManager.f90

@@ -1223,6 +1223,7 @@ subroutine reallocate_charstr1d(acharstr1d, ilen, nrow, name, mem_path)
       ! -- copy existing values
       do n = 1, nrow_old
         astrtemp(n) = acharstr1d(n)
+        call acharstr1d(n)%destroy()
       end do
       !
       ! -- fill new values with missing values
@@ -1242,6 +1243,7 @@ subroutine reallocate_charstr1d(acharstr1d, ilen, nrow, name, mem_path)
       ! -- fill the reallocated character array
       do n = 1, nrow
         acharstr1d(n) = astrtemp(n)
+        call astrtemp(n)%destroy()
       end do
       !
       ! -- deallocate temporary storage
@@ -2009,6 +2011,7 @@ subroutine deallocate_charstr1d(astr1d, name, mem_path)
     type(MemoryType), pointer :: mt
     logical(LGP) :: found
     type(MemoryContainerIteratorType), allocatable :: itr
+    integer(I4B) :: n
     ! -- code
     !
     ! -- process optional variables
@@ -2033,6 +2036,9 @@ subroutine deallocate_charstr1d(astr1d, name, mem_path)
                        terminate=.TRUE.)
     else
       if (mt%master) then
+        do n = 1, size(astr1d)
+          call astr1d(n)%destroy()
+        end do
         deallocate (astr1d)
       else
         nullify (astr1d)