Testcase 1 is not giving output

[gaurav13998 (Gaurav Bhatt)]

problem: https://hack.codingblocks.com/contests/c/537/96
code;
https://ide.codingblocks.com/s/55624

[Anubhav-Aron-1353657628083250 (Anubhav Aron)]

Test case failed:
s=01
Problem in line number 12
you are using if(str[digit]=="")

[gaurav13998 (Gaurav Bhatt)]

thank You so much…