An explanation section for these kind of kata should be provided.

daemon is demon

myjinxin thanks for the wonderful KATA

Today I solved only 1 kata ...

Kata should be updated to make explicit for languages like Ruby that mutating the original string is disallowed (otherwise the random tests break).
I get that it's often best practice, but it's not obvious from the instructions or the sample cases.

I see
Thanks!

As i said to @mamafrantz, the problem might be that you're changing the given string

you can stick puts tweet on the first line and see it on the console at runtime.

Fixed :)

Can you show me your code please ? I tested the string you gave me with the actual solution, and I got the correct answer, I'm pretty sure you're modifying the string given in input.

Imposible to solve in java, AssertEquals is not in the correct order, if you return "abc" it says "expected abc but was covfefe". Fix it, it's easy to fix, come on!

I don't see a test case in ruby where covfefe("nothing") returns nothing.
Also, sometimes coverage is the last word so the sentence ends with covfefe not because coverage was not found, but because coverage is the last word

Fixed :p