* struct: cstring_t which defines a expandable c string type in heap memory
*
* function: cstring_init to intialize struct of type cstring_t
- * function: cstring_t->expand to add one character to the string
+ * function: cstring_t->expand to add one character to the struct
+ * function: cstring_t->expand_arr to add a string to the struct
+ * function: cstring_t->reset to clear and reuse the struct
* function: cstring_t->delete to free the allocated memory
*
* Example:
