add a missing header guard #161

	name: reacting_bubble

	on: [pull_request]
	jobs:
	reacting_bubble-2d:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Get submodules
	run: \|
	git submodule update --init
	cd external/Microphysics
	git fetch; git checkout development
	cd ../amrex
	git fetch; git checkout development
	cd ../..

	- name: Install dependencies
	run: \|
	sudo apt-get update -y -qq
	sudo apt-get -qq -y install curl g++>=9.3.0

	- name: Compile reacting_bubble
	run: \|
	cd Exec/test_problems/reacting_bubble
	make DIM=2 USE_MPI=FALSE -j 2

	- name: Run reacting_bubble
	run: \|
	cd Exec/test_problems/reacting_bubble
	./Maestro2d.gnu.ex inputs_2d_regression maestro.max_step=10

	- name: Build the fextrema tool
	run: \|
	cd external/amrex/Tools/Plotfile
	make programs=fextrema -j 2

	- name: Check the extrema
	run: \|
	cd Exec/test_problems/reacting_bubble
	../../../external/amrex/Tools/Plotfile/fextrema.gnu.ex reacting_bubble_2d_plt0000010 > fextrema.out
	diff fextrema.out ci-benchmarks/reacting_bubble_2d_extrema.out

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