37: Add solution for Rust track exercise "Armstrong Numbers".

Created by  Aaw9nJhsNmfzFih9mKyNw9mV8CgERXJkRa1kK1Kx3LQH  on October 9, 2021
C2LTUL3CMWSRMFLOA5DF7PS5UC7UG4KTJEAIAACRSN74VZVKWE3QC
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