challenge description : The backup of our data was somehow corrupted. Recover the data and be rewarded with a flag.
challenge hint : Try a tool a surgeon might use.
challenge file : data-backup
		step by step writeup : 			1- discover file type ( command file data-backup)			2- extract printable strings from file ( i notice there are some file named ( flag.png , flag.pdf ..etc)			3- extract files using binwalk command ( binwalk --dd=".*" /home/kali/Desktop/data-backup )			4- we got file type zip file BA5D3.zip			5- trying to extract files from zip file but the file was corrupt			6- using winrar tool repair archive tools > repair archive 			7- got file named rebuilt.BA5D3.zip try to extract file and find out the content 			8- flag was in flag.pdf file  ### 				flag : jctf{fun_w17h_m461c_by735}