How should I practice Count Case-Insensitive Key Changes?

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Count Case-Insensitive Key Changes

ZipRecruiter● EasyNEW GRADOA

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Problem statement

You are given a nonempty string recording of uppercase and lowercase English letters typed in order.

Uppercase and lowercase versions of the same letter use the same physical key. Return how many adjacent transitions change to a different key after case normalization.

Function

countKeyChanges(recording: String) → int

Examples

Example 1

recording = "aAbBc"return = 2

After normalization the sequence is a, a, b, b, c, which changes twice.

Example 2

recording = "Zz"return = 0

Both characters use the same key.

Constraints

1 <= recording.length <= 100000
recording contains only English letters.