Oh yeah, I changed the name of the function, it was not find_odd()

Did you change the name of the solution function? Your solution should be named find_odd, did you change this?

It gives this error:

error[E0432]: unresolved import super::find_odd
--> src/lib.rs:25:9
|
25 | use super::find_odd;
| ^^^^^^^^^^^^^^^ no find_odd in the root

For more information about this error, try rustc --explain E0432.
error: could not compile challenge due to previous error

NOTE: Line numbers in error messages can be incorrect due to concatenation.