Finalize the program in C (ANSI C / C89) - the game Shooting Stars (calculated minimum sequence of moves)

It is necessary to finish or refine a C program that already has initial code.

Important: There is no need to create a game with graphics or interactivity. The program should only calculate and output the minimum sequence of moves that leads to a winning configuration.

Main requirements:

1. Language and standard: ANSI C / C89
2. Compilation: gcc -std=c90 -Wall -Wpedantic file.c -o file -lm

The program should not produce errors or warnings.

3. Functionality:

Takes one command line argument — a file with the initial configuration (3x3 characters: * = star, . = black hole).

Outputs the minimum sequence of moves for a winning configuration:

***

*.*

***

Cells are numbered:

0 1 2

3 4 5

6 7 8

If a win is impossible — outputs -1.

If the configuration is already winning — outputs nothing.

4. Data structures:

Use lists, stack, or queue through nodes and pointers (not arrays).

5. Memory:

Allocated memory through malloc must be freed through free().

Check with Valgrind.

6. Other requirements:

The program does not interact with the user, does not use temporary files.

Comments in the code are desirable for clarity.

The program should be efficient and understandable.

7. Initial code:

The code will be provided after agreement with the performer.

Payment:

Can be agreed upon after assessing the complexity.

If possible, payment via PayPal.