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

2025.02.28/05Ex/solve.c

@@ -0,0 +1,28 @@
+#include "solve.h"
+
+void t5_solve(char **a, int n, int (*cmp)(const char *, const char *))
+{
+	char *temp;
+	size_t size_c = sizeof(char);
+	int i, min;
+	for (i=0; i < n-1; ++i)
+	{
+		min = minimum(a+i*size_c, n-i, cmp)+i;
+		temp = a[min];
+		a[min] = a[i];
+		a[i] = temp;
+	}
+}
+
+int minimum(char **a, int n, int (*cmp)(const char *, const char *))
+{
+	int i, min=0;
+	if (n <= 0) return 0;
+	for (i = 1; i < n; ++i)
+	{
+		if (cmp(a[min], a[i]) > 0) min = i;
+	}
+
+	return min;
+}
+