Replace std::string with String

Author: pennam

libraries/WiFi/src/WiFi.cpp

@@ -342,15 +342,15 @@ wiced_result_t whd_firmware_check_hook(const char *mounted_name, int mount_err)
 {
     DIR *dir;
     struct dirent *ent;
-    std::string dir_name(mounted_name);
+    Sting dir_name(mounted_name);
     if(mount_err) {
         wiced_filesystem_mount_error();
     } else {
         if ((dir = opendir(mounted_name)) != NULL) {
             // print all the files and directories within directory
             while ((ent = readdir(dir)) != NULL) {
-                fullname =  "/"+ dir_name + "/" + std::string(ent->d_name);
-                if (std::string(ent->d_name) == WIFI_FIRMWARE_NAME) {
+                fullname =  "/"+ dir_name + "/" + Sting(ent->d_name);
+                if (Sting(ent->d_name) == WIFI_FIRMWARE_NAME) {
                     closedir(dir);
                     firmware_available = true;
                     // Update Mbed resource default mount point /wlan