Watch for any "use" keywords. Indeed, sorted() needs the Itertools crate.

by that time i didn't know about sprintf)

yeah,asprintf is not standard.should use malloc and so on.

number of *printf parameters not corresponding with number of parameters in input string is UB

IIUC if there are more arguments than required by format, the extraneous arguments are evaluated and ignored.

Ref: https://en.cppreference.com/w/c/io/fprintf

your freeing doesn't happen - it's after the return

asprintf is not standard

static size can be broken

*printf needs %zu for size_t

in the last sprintf %i must be %zu instead :/

strcat spam is what happens when you don't know about sprintf

strcat spam is what happens when you don't know about sprintf

static size can be broken

otherwise, one of the best per-the-standard solutions here

accessing names[1] if it's an array of length 1 is UB
asprintf is not standard
number of *printf parameters not corresponding with number of parameters in input string is UB

static size can be broken
1KiB on each new string is wasteful

asprintf is not standard

static size can be broken
wasting 2KB on each such string is wasteful...