Started String type implementation

src/string.h

@@ -0,0 +1,63 @@
+#ifndef STRING_H
+#define STRING_H
+
+#define RESULT_MSG_SIZE 64
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#include "vector.h"
+
+typedef vector_t *string_t;
+
+typedef enum {
+    STRING_OK = 0x0,
+    STRING_ERR_ALLOCATE,
+    STRING_ERR_OVERFLOW,
+    STRING_ERR_UNDERFLOW,
+    STRING_ERR_INVALID,
+    STRING_ERR_NOT_FOUND
+} string_status_t;
+
+typedef struct {
+    string_status_t status;
+    uint8_t message[RESULT_MSG_SIZE];
+    union {
+        string_t string;
+        vector_t *split_str;
+        bool string_eq;
+        char character;
+    } value;
+} string_result_t;
+
+#ifdef __cplusplus
+/* extern "C" { */
+#endif
+
+// Public APIs
+string_result_t string_new(const char *c_str);
+string_result_t string_eq(const string_t x, const string_t y, bool case_sensitive);
+string_result_t string_concat(const string_t x, const string_t y);
+string_result_t string_substr(const string_t dest, const string_t query);
+string_result_t string_to_upper(string_t str);
+string_result_t string_to_lower(string_t str);
+string_result_t string_reverse(string_t str);
+string_result_t string_split(const string_t str, const string_t delimiter);
+string_result_t string_trim(string_t str);
+string_result_t string_get_at(const string_t str, size_t idx);
+string_result_t string_set_at(string_t str, size_t idx, char c);
+string_result_t string_is_empty(const string_t str);
+string_result_t string_last(const string_t str);
+string_result_t string_destroy(string_t str);
+
+// Inline methods
+static inline size_t string_length(const string_t str) {
+    return str ? vector_size(str) : 0;
+}
+
+#ifdef __cplusplus
+/* } */
+#endif
+
+#endif