This random test for Rust is wrong (should be gold because of R,o,P,R,P,q,O):

assertion failed: `(left == right)`
  left: `"Gold!"`,
 right: `"Silver!"`: should work for random input "lfJULRrzZoPREzPMUqO"

Additionally, this basic test is wrong (should be gold because of d,o,P,o):

assert_eq!(olympic_ring("wHjMudLwtoPGocnJ"), "Bronze!");