пример простой архивации строки

to archive the line

#include<conio.h>
#include<stdio.h>
#include <string.h>
int main(){
	char str[100], repeat;
	gets(str);
	int i=0, count = 1, k=0, tempCount =0, length=strlen(str);
	repeat = str[0];
	for (i=1;str[i]!='\0';i++)
	{
		if((str[i]!=repeat)&&(count>3))
		{
			tempCount = 0;
			k=i-count;
			str[k]='@';
			str[k+1]=count+48;
			str[k+2]=repeat;
			for(k+=3;tempCount<length-count+1;k++,tempCount++)
			{
				str[k]=str[k+count-3];
			}
			i=i-count+3;
			count=1; repeat=str[i];
		}
		else
		if (str[i]!=repeat)
		{
			repeat=str[i];
			count=1;
		}
		else
		{
			count++;
		}
	}
	printf("\n%s",str);
	
	for (i=1;str[i]!='\0';i++)
	{
		length=strlen(str);
		if((str[i]>=48)&&(str[i]<=57))
		{
			tempCount=0;
			count = (int)str[i]-48;
			repeat = str[i+1];
			for(k=length;tempCount<length-2;k--,tempCount++)
			{
				str[k+count-3]=str[k];
			}
		for(k=0,tempCount=i-1;k<count;tempCount++,k++)
		{
			str[tempCount]=repeat;
		}
		i=i+count-2;
		}
	}
	printf("\n%s",str);
	getch();
	return 0;
}