Challenge: Trace the Complete Path of a Journey

Try to solve the Trace the Complete Path of a Journey problem.

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Statement

Given an array paths, where pathsipaths_i contains a pair of strings [sourcei,destinationi][source_i, destination_i] representing there exists a direct path from sourceisource_i to destinationidestination_i. Return the correct sequence of the whole journey from the first city to the last.

Note: It is guaranteed that a journey always exists.

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