Fix: Correctly count length of longer lines when including newline escape sequence '\n'

The previous version of get_line did not increment the length counter for the final newline character when the line exceeded MAXLINE.
This commit adds a check after counting the extra characters before EOF and '\n'
Incrementing the counter if there was an escape sequence for newline

Author: MuhammadSalah-MS

chapter_1/exercise_1_16/longest_line.c

@@ -54,6 +54,10 @@ int get_line(char line[], int maxline)
     ++i;
     c = getchar();
   }
+  
+  if (c == '\n')
+    ++i;
+
   return i;
 }