Added new string element function

source/libublsettings-char.c

@@ -115,8 +115,25 @@ int yon_char_check_element(char *target, char *element, char *divider){
     config_str parsed = yon_char_parse(target,&size,divider);
     int found = yon_char_parsed_check_exist(parsed,size,element);
     yon_char_parsed_free(parsed,size);
-    return !!found;
+    return found>-1;
-    return 0;
+}
+
+char *yon_char_swap_element(const char *source, const char *a, const char *b, const char *divider){
+    if (yon_char_is_empty(source)||yon_char_is_empty(a)||yon_char_is_empty(b)) return 0;
+    int size;
+    config_str parsed = yon_char_parse(source,&size,divider);
+    int found_a = yon_char_parsed_check_exist(parsed,size,a);
+    int found_b = yon_char_parsed_check_exist(parsed,size,b);
+    if (found_a>-1&&found_b>-1){
+        char *temp = parsed[found_a];
+        parsed[found_a] = parsed[found_b];
+        parsed[found_b] = temp;
+        char *full = yon_char_parsed_to_string(parsed,size,divider);
+        yon_char_parsed_free(parsed,size);
+        return full;
+    }
+        yon_char_parsed_free(parsed,size);
+    return NULL;
 }
 
 // char *yon_char_remove_element(char *target, char *element, char *divider){

source/libublsettings.h

@@ -696,6 +696,15 @@ char *yon_cut(char *source, int size, int startpos);
 
 int yon_char_check_element(char *target, char *element, char *divider);
 
+
+/// @brief Swap 2 substrings.
+/// @param source Source string
+/// @param a First substring to swap 
+/// @param b Second substring to swap
+/// @param divider String divider
+/// @return Type: char*. String with swapped substrings. The data is owned by the caller of the method.
+char *yon_char_swap_element(const char *source, const char *a, const char *b, const char *divider);
+
 /**
  * @brief Check if string begins with substring.
  *