Adapt forward to output nodes of exports being pointer of pointer.

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/_mem_offset.jinja

+{% for outidx in range(nb_out) -%}
+{{out_cdtype[outidx]}}* {{out_name[outidx]}} = ({{out_cdtype[outidx]}}*) mem + {{out_name[outidx]|upper}}_OFFSET;
+{% endfor %}

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/add.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 aidge_add_float32(
     {{in_name[0]}},
     {{in_name[1]}},

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/atan.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 aidge_atan <{{name|upper}}_OUTPUTS_SIZE> ({{in_name[0]}}, {{out_name[0]}});

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/concat.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 
 float* {{ name|upper }}_INPUTS[] = {
     {%- for i in range(nb_in) -%}

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/conv_kernel.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 N2D2_Export::convcellPropagate<{{ in_name[0]|upper }}_NB_CHANNELS,
                                {{ in_name[0]|upper }}_IN_HEIGHT,
                                {{ in_name[0]|upper }}_IN_WIDTH,

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/fc_kernel.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 N2D2_Export::fccellPropagate<{{ in_name[0] | upper }}_NB_CHANNELS,
                              {{ in_name[0] | upper }}_IN_HEIGHT,
                              {{ in_name[0] | upper }}_IN_WIDTH,

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/mul.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 aidge_mul_float32(
     {{in_name[0]}},
     {{in_name[1]}},

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/pool_kernel.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 N2D2_Export::poolcellPropagate<{{ in_name[0]|upper }}_NB_CHANNELS,
                                {{ in_name[0]|upper }}_IN_HEIGHT,
                                {{ in_name[0]|upper }}_IN_WIDTH,

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/relu.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 aidge_relu_float32({{in_name[0]}}, {{out_name[0]}},  {{name|upper}}_INPUTS_SIZE);

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/slice.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 aidge_slice_float32 ({{in_name[0]}}, {{out_name[0]}}, {{name|upper}}_AXES, {{name|upper}}_STARTS, {{name|upper}}_ENDS, {{name|upper}}_NB_AXES, {{name|upper}}_NB_CHANNELS);

aidge_export_arm_cortexm/_Aidge_Arm/templates/forward_call/sub.jinja

-{% if not is_output %}
-{{out_cdtype[0]}}* {{out_name[0]}} = ({{out_cdtype[0]}}*) mem + {{out_name[0]|upper}}_OFFSET;
-{% endif %}
+{% include "./_mem_offset.jinja" %}
+
 
 aidge_sub_float32({{in_name[0]}}, {{in_name[1]}}, {{out_name[0]}}, {{name|upper}}_OUTPUTS_SIZE);