It's stated in the problem that RNA cannot have 'T' and DNA cannot have 'U', so how could both of them be in the same sequence for either type?

Clippy from the Rust tool chain has a hint for optimising the code:

2 |     dna.replace("T", "U")
  |                 ^^^ help: try using a `char` instead: "T"
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
  = note: `#[warn(clippy::single_char_pattern)]` on by default

you could try "UUTT",it supposed to be "TTUU"

As a very beginner to Java, I didn't even know this method exists lol. That's why I love CodeWars, always learning something new here

This issue is still present

Thanks, good point. It's not immediately evident why it's not already a string, especially to new Rust users. I've added some hints and a link to docs that give some explanation. Still feel lost on this kata, please add a comment here.

Probably, would be good to include some info about the difference.

I am crazy about this solutions.

Finally i also have the same :D

Same issue here:

• ctrl + enter: doesn't work
• ctrl + u: opens page source
• ctrl + i: doesn't work
• ctrl + s: submit

windows 7, chrome 45

yeah i have the same :D