Contracting string in C++

Question

guys i want to contract a string.
for example contract hhPwwwttttn into h2Pw3t4n.
please help me, its so important for me.

Answer 1

char a[100];
cin>>a;
char b[100]; int j=0;
for(int i=0;i<a.length;i++)
{ int ctr=0;
while(a[i]==a[i-1])
{ i++;
ctr++;
}
b[j++]=a[i];
if(ctr>1)
b[j++]=char(ctr+1);

}

remember this code will work if repetetions are less than 10.
however u can optimise program