How to shuffle characters within a string in C

I am creating a program and part of it needs to take a word, and jumble the letters. I know that there is officially no string data type within C, so technically the characters in the word are already in array? They just need sorting. (That is my understanding anyway). I also know that C isn't very good for actual random numbers, I normally use the time as the seed, not sure if this would affect shuffling the letters.

For instance:

The word Hello

Split into Characters H/E/L/L/O

Shuffled E/L/O/H/L

New word Elohl