* [fix][components][utilities]adjust the order of compiler macros
Signed-off-by: NWillianChan <chentingwei@rt-thread.com>

* [modify][components][utilities]This PR complies with RT-Thread code specification
Signed-off-by: NWillianChan <chentingwei@rt-thread.com>

* [fix][components][utilities][var_export]replace the search algorithm and fix some problems
Signed-off-by: NWillianChan <chentingwei@rt-thread.com>

* [modify][components][utilities][var_export]make the code more beautiful
Signed-off-by: NWillianChan <chentingwei@rt-thread.com>