get_fnptr_name
char *get_fnptr_name(struct expression *expr);
name = get_fnptr_name(call->fn);
fn = get_fnptr_name(call->fn);
ptr = get_fnptr_name(call->fn);
name = get_fnptr_name(call->fn);
fn_name = get_fnptr_name(tmp);
fn_name = get_fnptr_name(right);
ptr_name = get_fnptr_name(expr->left);
fn_name = get_fnptr_name(expr);