refactor(structure): normalize folder names with leading zeros for consistency

- Renamed all folders from format NEx (e.g., 1Ex, 2Ex...) to 0NEx (01Ex, 02Ex, etc.)
- Updated subdirectories and files accordingly
- Removed old main Makefile and tasks (a01.c–a09.c, solve.c, io_status.h), likely obsolete
- Cleaned up deprecated task binaries and configs

2025.03.07/01Ex/solve.c

@@ -0,0 +1,14 @@
+#include "solve.h"
+#include "math.h"
+
+#define eps 1e-6
+
+int t1_solve(double *a, int n)
+{
+	int i, j;
+	for (i = 0; i < n; i++)
+		for (j = i; j < n; j++)
+			if (i != j)
+				if (fabs(a[i * n + j] - a[j * n + i]) > eps) return 0;
+	return 1;
+}