created separate function for hex to char

Dependencies:   SDFileSystem ds3231 eeprom_Nikita mbed testUniGraphic_150217

Fork of SS_SensePOC2P0_11Dec2017_USERPID by rashmi v

Revision:
72:1f990fa8c516
Parent:
50:b42238e7f46d
--- a/sdcard.h	Fri Dec 01 11:18:34 2017 +0000
+++ b/sdcard.h	Wed Dec 06 12:47:30 2017 +0000
@@ -59,5 +59,5 @@
 //void readfile(uint32_t pid);
 void read_structure(FILE *fp_read_sdcard_file);
 void read_sdcard_file();
-// void print_structure(uint32_t pid);
+uint8_t dummy_file_create_delete();
 #endif 
\ No newline at end of file