Sorting Sub item of navigation menu using code

I am adding product category as a new Sub menu item in main parent
“Categories” menu at front.but they are not sorted. Sub item menu are adding at the last.
My current menu structure like this:
Categories
-Audio
-smartphone
-book

I need to sort them in alphabetically order
output like:
Categories
-Audio
– book
-smartphone
This way. Any one can help me. i am working on this last 8 days

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