Can i include blender scripts in each other?

Question

I created two blender scripts :

• a MeshCleaner : that cleans the meshes for my glb file
• a HierarchyCleaner : that cleans the hierarchy for my glb files

To clean the code , i added an IOHandler for reading and writing glb files so i can reuse the IOHandler in both the MeshCleaner and the HierarchyCleaner . When running one of the scripts i run blender in the background

• MeshCleaner.py

import bpy
from .IOHandler import import_gltf_file , export_gltf_file , read_filename
def remove_default_cube ():
    objs = bpy.data.objects
    objs.remove(objs["Cube"], do_unlink=True)
def clean_heavy_gltf_file(filename):
    import_gltf_file(filename)
    export_gltf_file(filename)
if name=="main":
    remove_default_cube()
    filename = read_filename()
    clean_heavy_gltf_file(filename)

• HierarchyCleaner.py

import bpy
from IOHandler import import_gltf_file , export_gltf_file , read_filename
from MeshCleaner import remove_default_cube
def clean_hierarchy():
    objs = bpy.data.objects
    nodes=objs.values()
    print(nodes)
    for node in nodes :
        if(len(node.children)==0):
            node.name=node.data.name
def correct_file(filename):
    import_gltf_file(filename)
    remove_default_cube()
    clean_hierarchy()
    export_gltf_file(filename)
if name=="main":
    correct_file()

• IOHandler.py:

import bpy
import sys
def import_gltf_file(filename):
    bpy.ops.import_scene.gltf(filepath = filename)
def export_gltf_file(filename):
    bpy.ops.export_scene.gltf(filepath = filename)
def read_filename():
    filename=sys.argv[4]
    return filename

I run the code using sh scripts running :

GLB_FILE=$1 ;
blender --background --python HierarchyCleaner.py $GLB_FILE ;

or

GLB_FILE=$1 ;
blender --background --python MeshCleaner.py $GLB_FILE ;

when trying to run the code i have an ImportError stating that there is no such module as IOHandler . all the scripts are within the same directory .

Is there a way to make this work and ?