Function eval_call 

pub fn eval_call(
    func_form: &Form,
    arg_forms: &[Form],
    env: &mut Env,
) -> EvalResult

Evaluate a call expression (func-form arg1 arg2 ...).

Handles:

• Macro expansion (if callee is a macro).
• The apply function (spread last arg).
• The swap! function (needs env to call the function).
• Regular function calls.