def out_timestep_func_to_file(outfile):
    add_to_Cfunction_dict_find_timestep()
    with open(outfile, 'w') as file:
        file.write(outC_function_dict['find_timestep'])
def out_timestep_func_to_file(outfile):
    add_to_Cfunction_dict_find_timestep()
    with open(outfile, 'w') as file:
        file.write(outC_function_dict['find_timestep'])