Fix insert and remove method

[arriqaaq]

Description

This pull request (PR) addresses two critical issues:

1. Bug in remove Method

• Issue: The remove method previously had a significant bug where it would remove all children matching a particular prefix without considering the type of the child node.
• Fix: The method has been updated to include a check on the type of child node before performing the removal. This ensures that only the intended nodes are removed, maintaining the integrity of the tree structure.

2. Enhancement in insert Method

• Issue: The insert method did not check if the node type was full before attempting to add children. This could lead to failures when the tree is shrunk to the last key and a new key is inserted without prior growth.
• Fix: The method now first checks if the node type is full. If it is, the node is grown accordingly before adding any children. This preemptive growth ensures that the tree can accommodate new keys without failing.

These changes improve the reliability and robustness of the tree's remove and insert operations.

[emmanuel-keller]

LGTM!

[phughk]

Nice one