Programming :: Converting String Sequence Of 1's And 0's Into Their Hexa Sequences

I have to write a code that converts a sequence of 1's and 0's(block) into their equivalent hexa number and copying to another array(byte). but this sequence is not always of length 8 and you are required to send strlen(sequence)%8 bits back into the string. So i've written down this code and it works well with the sample input but fails in the real program.

Code:
int Convert_encode( char * block,unsigned char * byte)
{
int len,iter,i,j,k,sum;
char * temp=(char *)malloc(4*sizeof(char));
len=strlen(block)/8;

[code]....