I have some pseudo code of what the function needs to do. This is in C

function

kstring kstralloc(size_t nbytes)

Creates and returns a new kstring object with the specified length. The .length member of the returned kstring should be equal to nbytes. The .data member should be a pointer to newly-allocated memory; the memory should be initialized by filling it with nbytes copies of the null byte ('\0').

If there is an error allocating memory, this function should call abort() or throw an uncaught exception.

Note: your program must support allocating (and subsequently using and freeing) zero-byte strings.