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/Makefile

@@ -0,0 +1,19 @@
+FLAGS = -fstack-protector-all -W -Wall -Wextra -Wunused -Wcast-align -Werror -pedantic -pedantic-errors -Wfloat-equal -Wpointer-arith -Wformat-security -Wmissing-format-attribute -Wformat=1 -Wwrite-strings -Wcast-align -Wno-long-long -std=gnu99 -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wold-style-definition -Wdeclaration-after-statement -Wbad-function-cast -Wnested-externs -O3
+
+a05.exe: main.o array.o solve.o sort.o
+	gcc main.o solve.o array.o sort.o -o a05.exe -lssp
+
+main.o: main.c
+	gcc $(CFLAGS) -c main.c
+
+solve.o: solve.c
+	gcc $(FLAGS) -c solve.c
+
+array.o: array.c
+	gcc $(CFLAGS) -c array.c
+
+sort.o: sort.c
+	gcc $(CFLAGS) -c sort.c
+
+clean:
+	del *.o *.exe