Model name is not a valid Java name

Model name is not a valid Java name Help!
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// Made with Blockbench 3.5.2
// Exported for Minecraft version 1.15
// Paste this class into your mod and generate all required imports

public class geometry.zombie extends EntityModel<Entity> {
    private final ModelRenderer body;
    private final ModelRenderer leftArm;
    private final ModelRenderer rightArm;

    public geometry.zombie() {
        textureWidth = 64;
        textureHeight = 32;

        body = new ModelRenderer(this);
        body.setRotationPoint(0.0F, 0.0F, 0.0F);
        body.setTextureOffset(0, 0).addBox(-4.0F, 0.0F, -3.0F, 8.0F, 13.0F, 6.0F, 0.0F, false);

        leftArm = new ModelRenderer(this);
        leftArm.setRotationPoint(-5.0F, 2.0F, 0.0F);
        leftArm.setTextureOffset(0, 0).addBox(-4.0F, -2.0F, -3.0F, 5.0F, 12.0F, 6.0F, 0.0F, false);

        rightArm = new ModelRenderer(this);
        rightArm.setRotationPoint(5.0F, 2.0F, 0.0F);
        rightArm.setTextureOffset(0, 0).addBox(-1.0F, -2.0F, -3.0F, 5.0F, 12.0F, 6.0F, 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);
        leftArm.render(matrixStack, buffer, packedLight, packedOverlay);
        rightArm.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;
    }
}