Model Name is not a valid java name, cannot import model to mcreator

my model name is not a valid java name when importing, here is code of my model plz help fix

public class geometry.irongolem extends EntityModel<Entity> {
    private final ModelRenderer body;
    private final ModelRenderer head;
    private final ModelRenderer arm0;
    private final ModelRenderer arm1;
    private final ModelRenderer leg0;
    private final ModelRenderer leg1;

    public geometry.irongolem() {
        textureWidth = 128;
        textureHeight = 128;

        body = new ModelRenderer(this);
        body.setRotationPoint(0.0F, -7.0F, 0.0F);
        body.setTextureOffset(0, 0).addBox(-6.0F, -2.0F, -3.0F, 12.0F, 12.0F, 5.0F, 0.0F, false);
        body.setTextureOffset(0, 17).addBox(-5.5F, 10.0F, -3.0F, 11.0F, 5.0F, 5.0F, 0.5F, false);

        head = new ModelRenderer(this);
        head.setRotationPoint(0.0F, -7.0F, -2.0F);
        head.setTextureOffset(32, 11).addBox(-3.0F, -9.0F, -1.5F, 6.0F, 7.0F, 6.0F, 0.0F, false);

        arm0 = new ModelRenderer(this);
        arm0.setRotationPoint(0.0F, -7.0F, 0.0F);
        arm0.setTextureOffset(0, 48).addBox(6.0F, -1.5F, -2.0F, 4.0F, 18.0F, 3.0F, 0.0F, false);

        arm1 = new ModelRenderer(this);
        arm1.setRotationPoint(0.0F, -7.0F, 0.0F);
        arm1.setTextureOffset(36, 36).addBox(-10.0F, -1.5F, -2.0F, 4.0F, 18.0F, 3.0F, 0.0F, false);

        leg0 = new ModelRenderer(this);
        leg0.setRotationPoint(4.0F, 11.0F, 0.0F);
        leg0.setTextureOffset(18, 27).addBox(-2.5F, -3.0F, -3.0F, 4.0F, 16.0F, 5.0F, 0.0F, false);

        leg1 = new ModelRenderer(this);
        leg1.setRotationPoint(-5.0F, 11.0F, 0.0F);
        leg1.setTextureOffset(0, 27).addBox(-0.5F, -3.0F, -3.0F, 4.0F, 16.0F, 5.0F, 0.0F, false);
    }

    @Override
    public void setRotationAngles(Entity entity, float limbSwing, float limbSwingAmount, float ageInTicks, float netHeadYaw, float headPitch){
        //previously the render function, render code was moved to a method below
    }

    @Override
    public void render(MatrixStack matrixStack, IVertexBuilder buffer, int packedLight, int packedOverlay, float red, float green, float blue, float alpha){
        body.render(matrixStack, buffer, packedLight, packedOverlay);
        head.render(matrixStack, buffer, packedLight, packedOverlay);
        arm0.render(matrixStack, buffer, packedLight, packedOverlay);
        arm1.render(matrixStack, buffer, packedLight, packedOverlay);
        leg0.render(matrixStack, buffer, packedLight, packedOverlay);
        leg1.render(matrixStack, buffer, packedLight, packedOverlay);
    }

    public void setRotationAngle(ModelRenderer modelRenderer, float x, float y, float z) {
        modelRenderer.rotateAngleX = x;
        modelRenderer.rotateAngleY = y;
        modelRenderer.rotateAngleZ = z;
    }
}