10: Add solution to Rust track exercise "Anagram".

Created by  9Zb2bmkejrNknawUtr3MKvVstZkVDR8x8ritfgZXKrky  on December 23, 2021
2MPN73UJBT4AA44CVFCBRLB4BRO44BNASUXTFF3NZIEFN7EGENWQC
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