Rust translation. Please review and approve

It was difficult at first, but I did it.
Nice kata!

D translation

It was hard, I spent 2 days and 2 nights, but I made it. It's fucking awesome!
Good for everyone

thanks for the tip

ahh, okay I think I get what you're saying thank you

You need to do a deeper analysis of the group, it is not enough to take the most popular letter of the group and assume that it was encoded with the letter "E" (this does not always work). Look at it this way - each group is encrypted with the Caesar cipher and for that group you need to understand what shift was used in its encryption. By analyzing the shift - you can find the correct letter.

Сначала не понял, а потом как понял)

Cool kata

Loved the challenge!

nice kata!

Hi there.
I've resolved the algorith and most of interactions on random tests takes less then 20milisecons, but some times, when the keylenght is increasing, the amount of time to execute can reach 1.5 seconds specially after length 6+. So I've experiencing the 12seconds timeout of the server, normally after execute more than 110 random tests. Here’s my log:

Fixed tests
keylen: 8 key: CODEWARS this: 10ms tot: 28ms
keylen: 8 key: VIGENERE this: 7ms tot: 37ms
keylen: 7 key: BABBAGE this: 3ms tot: 42ms

Random tests
keylen: 1 key: E this: 2ms tot: 53ms
keylen: 1 key: A this: 2ms tot: 55ms
keylen: 1 key: X this: 1ms tot: 57ms
keylen: 1 key: F this: 1ms tot: 58ms
keylen: 1 key: C this: 1ms tot: 60ms
keylen: 1 key: F this: 3ms tot: 63ms
keylen: 1 key: I this: 1ms tot: 67ms
keylen: 1 key: R this: 1ms tot: 69ms
keylen: 1 key: W this: 1ms tot: 70ms
keylen: 1 key: O this: 1ms tot: 72ms
keylen: 1 key: I this: 1ms tot: 74ms
keylen: 1 key: W this: 1ms tot: 75ms
keylen: 1 key: C this: 1ms tot: 77ms
keylen: 1 key: V this: 1ms tot: 79ms
keylen: 1 key: P this: 1ms tot: 80ms
keylen: 1 key: O this: 1ms tot: 82ms
keylen: 1 key: Z this: 1ms tot: 83ms
keylen: 1 key: T this: 1ms tot: 85ms
keylen: 1 key: C this: 1ms tot: 87ms
keylen: 1 key: Y this: 2ms tot: 89ms
keylen: 2 key: NQ this: 1ms tot: 90ms
keylen: 2 key: BZ this: 1ms tot: 92ms
keylen: 2 key: FA this: 1ms tot: 94ms
keylen: 2 key: ZD this: 1ms tot: 95ms
keylen: 2 key: GP this: 12ms tot: 107ms
keylen: 2 key: OK this: 1ms tot: 108ms
keylen: 2 key: RB this: 1ms tot: 109ms
keylen: 2 key: QA this: 0ms tot: 110ms
keylen: 2 key: SV this: 5ms tot: 116ms
keylen: 2 key: FH this: 1ms tot: 117ms
keylen: 2 key: JK this: 1ms tot: 118ms
keylen: 2 key: IK this: 1ms tot: 119ms
keylen: 2 key: CM this: 1ms tot: 121ms
keylen: 2 key: XP this: 1ms tot: 122ms
keylen: 2 key: BK this: 1ms tot: 123ms
keylen: 2 key: XJ this: 2ms tot: 129ms
keylen: 2 key: RE this: 1ms tot: 130ms
keylen: 2 key: PB this: 1ms tot: 131ms
keylen: 2 key: VS this: 1ms tot: 132ms
keylen: 2 key: XL this: 1ms tot: 134ms
keylen: 3 key: VYA this: 1ms tot: 135ms
keylen: 3 key: UUP this: 3ms tot: 138ms
keylen: 3 key: JKT this: 3ms tot: 141ms
keylen: 3 key: TTY this: 3ms tot: 145ms
keylen: 3 key: VBG this: 2ms tot: 147ms
keylen: 3 key: COW this: 18ms tot: 166ms
keylen: 3 key: NQF this: 25ms tot: 191ms
keylen: 3 key: YAW this: 21ms tot: 213ms
keylen: 3 key: WHV this: 1ms tot: 214ms
keylen: 3 key: SPZ this: 3ms tot: 217ms
keylen: 3 key: BZL this: 25ms tot: 242ms
keylen: 3 key: CQH this: 1ms tot: 243ms
keylen: 3 key: DNR this: 1ms tot: 244ms
keylen: 3 key: HBQ this: 34ms tot: 278ms
keylen: 3 key: EUC this: 14ms tot: 292ms
keylen: 3 key: RQX this: 1ms tot: 293ms
keylen: 3 key: JVP this: 12ms tot: 305ms
keylen: 3 key: PRE this: 33ms tot: 339ms
keylen: 3 key: MFM this: 12ms tot: 351ms
keylen: 3 key: BGJ this: 1ms tot: 356ms
keylen: 4 key: DCOK this: 7ms tot: 363ms
keylen: 4 key: CSBP this: 5ms tot: 368ms
keylen: 4 key: OWGT this: 5ms tot: 374ms
keylen: 4 key: YXBY this: 292ms tot: 666ms
keylen: 4 key: OADY this: 3ms tot: 670ms
keylen: 4 key: XLXK this: 4ms tot: 674ms
keylen: 4 key: JJTI this: 253ms tot: 927ms
keylen: 4 key: CKMH this: 2ms tot: 929ms
keylen: 4 key: IHHJ this: 96ms tot: 1025ms
keylen: 4 key: IIZO this: 90ms tot: 1116ms
keylen: 4 key: BVPV this: 91ms tot: 1207ms
keylen: 4 key: RRHD this: 108ms tot: 1315ms
keylen: 4 key: AEOU this: 106ms tot: 1422ms
keylen: 4 key: PTFP this: 97ms tot: 1520ms
keylen: 4 key: EIGU this: 1ms tot: 1521ms
keylen: 4 key: PFUH this: 1ms tot: 1523ms
keylen: 4 key: IRAC this: 1ms tot: 1524ms
keylen: 4 key: RKCW this: 1ms tot: 1525ms
keylen: 4 key: THGB this: 2ms tot: 1527ms
keylen: 4 key: RXVJ this: 1ms tot: 1528ms
keylen: 5 key: LNGFN this: 18ms tot: 1546ms
keylen: 5 key: ITBFX this: 19ms tot: 1565ms
keylen: 5 key: EOGRB this: 80ms tot: 1645ms
keylen: 5 key: KUSUZ this: 9ms tot: 1655ms
keylen: 5 key: TCMXP this: 25ms tot: 1680ms
keylen: 5 key: LDIEY this: 586ms tot: 2266ms
keylen: 5 key: KBFFU this: 265ms tot: 2531ms
keylen: 5 key: EGSFO this: 2ms tot: 2534ms
keylen: 5 key: BQFLL this: 2ms tot: 2537ms
keylen: 5 key: QGLZI this: 3ms tot: 2541ms
keylen: 5 key: ZXZBP this: 148ms tot: 2690ms
keylen: 5 key: DCOKB this: 3ms tot: 2693ms
keylen: 5 key: XSYQX this: 84ms tot: 2777ms
keylen: 5 key: COXZM this: 2ms tot: 2781ms
keylen: 5 key: FNDNI this: 12ms tot: 2793ms
keylen: 5 key: CTTYY this: 20ms tot: 2814ms
keylen: 5 key: WJAFH this: 3ms tot: 2817ms
keylen: 5 key: YUNKP this: 14ms tot: 2831ms
keylen: 5 key: ACVYJ this: 3ms tot: 2834ms
keylen: 5 key: MQCGK this: 3ms tot: 2837ms
keylen: 6 key: YGFNPM this: 1442ms tot: 4279ms
keylen: 6 key: XPBXRS this: 281ms tot: 4561ms
keylen: 6 key: ALUKFO this: 4192ms tot: 8754ms
keylen: 6 key: NWPWXM this: 21ms tot: 8776ms
keylen: 6 key: HWJHBA this: 287ms tot: 9064ms
keylen: 6 key: BAEQQS this: 9ms tot: 9074ms

Rejected. No random tests.