crypto-square: Too verbose descriptions in the canonical data for C -> failing Travis build

When building tests for crypto-square in the 'C' track, naming the functions after the descriptions in the [canonical_data](https://github.com/exercism/problem-specifications/blob/master/exercises/crypto-square/canonical-data.json) leads to funny behavior when using indent.sh which leads to failing Travis build.

By funny behavior I mean running indent.sh on the same file leads to changes every time, which gets detected in Travis with the ```git diff``` check.

[Here is the link](https://github.com/exercism/c/pull/274#issuecomment-367941634) to the pull request where this was discovered.