From 442a49ad5a48d417345959b903ae6a6d32d55759 Mon Sep 17 00:00:00 2001
From: Haidong Ji
Date: Fri, 15 Apr 2022 15:51:30 -0500
Subject: Great C programming fun

Excellent fundamentals and displine training, many tools and techniques
exercises: gdb, emacs, valgrind, git
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+In a previous project, you wrote a function
+
+ void rotate(char matrix[10][10])
+
+which performed 90 degree clockwise rotation of a 10x10
+matrix.   In that assignment, we gave you a compiled
+object file which read the input matrix from a file,
+called your function to do the rotation, and then
+printed the result to the screen. 
+
+In this assignment, you will write the code that we
+previously gave you, making the complete program on your own.
+You are encouraged to make use of your previously written
+rotate function in this assignment.
+
+For this problem, you will be writing a program which 
+performs a 90 degree clockwise rotation of a 10x10 matrix.
+There is nothing special about a 10x10 matrix---I just need
+to fix the matrix size, since we have not learned about dynamic
+memory allocation yet, so we do not have the knowledge needed
+to read in any size of matrix.
+
+To keep the input processing simple, the matrix will be a matrix
+of characters (so you will have something like
+  char matrix[10][10]
+in your program), which will be read from a file.  Each line
+in the input file should contain 10 characters (plus a newline).
+
+Requirements:
+=============
+  - Create a file called rotateMatrix.c
+        - Your program will take one command line argument, a string
+    specifying the input file to read.
+  - The input file should contain 10 lines, each of which
+    have 10 (non-newline) characters (plus a newline).
+  - Your program should then rotate this 90 degrees clockwise,
+    and print the result on stdout.
+    Note that sample.txt provides sample input, and 
+    sample.out provides sample output.
+  - If there are any errors, your program should print an
+    appropriate message to stderr, and exit with EXIT_FAILURE.
+  
+Hints:
+------
+  - You may find the strchr useful for error checking that
+    you read a proper line (10 non-newline characters, then a newline).
+    
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