Constant GUEST_MAIN_TEMPLATE 

const GUEST_MAIN_TEMPLATE: &str = "{{ guest_attributes }}\n\nuse airbender::guest::read;{{ custom_allocator_block }}\n\n#[airbender::main{{ main_attr_args }}]\nfn main() -> u32 {\n    let value: u32 = read().expect(\"failed to read input\");\n    value + 1\n}\n";