how I could read a felt* from ap in Cairo lang?

Hey folks, do you know how I could read a felt* from ap?

I want to do something like this:

    let (hello : felt*) = alloc();
    tempvar world : felt* = hello;
    let world_like : felt* = [ap-1];

when I do tempvar world = hello, I ensure I add hello (the pointer) to [ap] and then I increase ap so world_like = [ap-1] should be the same thing than world

But I get this error:

Cannot assign an expression of type 'felt' to a reference of type 'felt*'.
    let world_like : felt* = [ap-1];

When doing a similar code:

        let (func_pc: felt*) = get_label_location(storage_var);
        _prepare_call(pedersen_ptr, range_check_ptr, len_inputs, inputs + len_inputs);
        call abs ap[11 - 6 * 2];

I get ``` Cannot apply subscript-operator to non-pointer, non-tuple type 'felt'. call abs ap[11 - 6 * 2]; // removing alloc_locals by calling ap[11-6*2] ?

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