Normalize and Filter Event Records

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Problem

Given an array of event record strings records, implement a Python function that returns a new array containing only valid transformed records. Each input string has the form "key:value". A record is valid if it contains exactly one colon, the key is non-empty after trimming spaces, and the value is non-empty after trimming spaces. For each valid record, return it as "KEY=value", where the key is uppercased and duplicate keys keep only their last valid value while preserving the key's first appearance order.

Constraints

1 <= len(records) <= 10^4
0 <= len(records[i]) <= 10^3
Each record is a Python string
Preserve first appearance order of valid keys
Ignore invalid records instead of raising errors

Function Signature

def transform_records(records):

Your solutionPython 3

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