14: Add solution to Rust track exercise "Sublist".

Created by  9Zb2bmkejrNknawUtr3MKvVstZkVDR8x8ritfgZXKrky  on December 24, 2021
QUYOVUM5VNQ2X5CMPIK2H6GHINF446TLBNGGUG4BHK4ONNV4EEFQC
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