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

2025.02.14/01Ex/array.c

@@ -0,0 +1,74 @@
+#include "array.h"
+
+
+io_status process_s(const char * s, char * s1, char * s2, const size_t len_s) {
+	size_t i;
+	int j;
+	for (i = 0, j = 0; i < len_s; ++i) {
+		if (s[i] == '\\') {
+			if (i + 1 == len_s) return ERROR_PATTERN;
+			else {
+				s1[j] = 0;
+				s2[j++] = s[++i];
+			}
+		} else if ((s[i] == '^') && (i == 0)) {
+			s1[j] = '1';
+			s2[j++] = s[++i];
+		} else {
+			s1[j] = '0';
+			s2[j++] = s[i];
+		}
+	}
+
+	s2[j] = '\0';
+
+	return SUCCESS;
+}
+
+io_status process_file(const char * f_in, const char * f_out, const char * s1, const char * s2, int * r) {
+	FILE * fp = fopen(f_in, "r");
+	if (!fp) return ERROR_OPEN;
+	else {
+		char buf[LEN] = {0};
+		size_t len_s = strlen(s2);
+		FILE * fw = fopen(f_out, "w");
+		int i;
+
+		if (!fw) {fclose(fp); return ERROR_OPEN;}
+		for (i = 0; fgets(buf, sizeof(buf), fp);) {
+			size_t len_buf = strlen(buf);
+			bool is_approach = process_string(buf, s1, s2, len_s, len_buf);
+
+			if (is_approach)
+			{
+				i++;
+				if (buf[len_buf - 1] == '\n') buf[len_buf - 1] = '\0';
+				fprintf(fw, "%s\n", buf);
+			}
+		}
+
+		*r = i;
+		fclose(fw);
+	}
+	
+	fclose(fp);
+
+	return SUCCESS;
+}
+
+bool process_string(const char * buf, const char * s1, const char * s2, const size_t len_s, const size_t len_buf) {	
+	if (len_buf < len_s) return false;
+	
+	if (s1[0] == '1') {
+		size_t i;
+		for (i = 0; i < len_s; ++i) {
+			if (buf[i] != s2[i]) return false;
+		}
+	} else {
+		char * s_pointer = strstr(buf, s2);
+		if (!s_pointer) return false;
+	}
+
+	return true;
+}
+