Trie-Based Word Replacement

In botany, a *root* word can replace a longer word if the longer word starts with (is descended from) the root. Given a dictionary of root words and a sentence, replace every word in the sentence with the shortest matching root word from the dictionary. If a word has no matching root, leave it unchanged.

Write a function `replaceWithRoots(rootWords, sentence)` that returns the modified sentence.

**Example 1:**
```
Input:
rootWords = ["cat", "bat", "rat"]
sentence = "the cattle was rattled by the battery"
Output: "the cat was rat by the bat"
```

**Example 2:**
```
Input:
rootWords = ["fly", "flyer", "sky"]
sentence = "a flyer landed in the skylight area"
Output: "a fly landed in the sky area"
```