#include <stdio.h>
 
int main(void) {
	char s[]="helloo";
 
	unsigned char last=0;          // remaining bits from previous iteration in high output part
	size_t j=5;                    // number of high input bits to keep in the low output part 
	unsigned char output=0; 
	for (char *p=s; *p; p++) {     // iterate on the string 
		do {
		    output = ((*p >> (8-j)) | last) & 0x1f;  // last high bits set followed by j bits shifted to lower part; only 5 bits are kept 
		    printf ("%02x ",(unsigned)output);
		    j += 5;                                  // take next block  
 	        last = (*p << (j%8)) & 0x1f;             // keep the ignored bits for next iteration 
		} while (j<8);                               // loop if second block to be extracted from current byte
		j -= 8;                                      
	}
	if (j)                                           // there are trailing bits to be output
	   printf("%02x\n",(unsigned)last); 
 
	return 0;
}
 

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