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The program must :

• Compile successfully
• Assemble all of the tetrominoes in order to create the smallest square possible.
• Identify each tetromino in the solution by printing them with uppercase latin letters (A for the first one, B for the second, etc)
• Expect at least one tetromino in the text file
• In case of bad format on the tetrominoes or bad file format it should print ERROR

Example of a text File

#...
#...
#...
#...

....
....
..##
..##

If it isn't possible to form a complete square, the program should leave spaces between the tetrominoes.

For example:

ABB.
ABB.
A...
A...

$ cat -e sample.txt
...#$
...#$
...#$
...#$
$
....$
....$
....$
####$
$
.###$
...#$
....$
....$
$
....$
..##$
.##.$
....$
$
....$
.##.$
.##.$
....$
$
....$
....$
##..$
.##.$
$
##..$
.#..$
.#..$
....$
$
....$
###.$
.#..$
....$

$ go run . sample.txt | cat -e
ABBBB.$
ACCCEE$
AFFCEE$
A.FFGG$
HHHDDG$
.HDD.G$
$