Array - Run Length Encoding

public String func (String str){
// write your code here
if(str==null)
{
    return null;
}
String output="";
String l="";
char dh;
int i,j=0,k,c=0,p=0,m=str.length();
for(i=0;i<m;i++){
    if(str.charAt(i)>='0' && str.charAt(i)<='9'){
        c++;
        if(c==1)
        j=i-1;
        l=l+str.charAt(i);
        p=Integer.valueOf(l);
        continue;
         }
         else
         if(p==0)
         output=output+str.charAt(i);
        if(p!=0){
            for(k=1;k<p;k++)
            output=output+str.charAt(j);
            i--;}
            p=0;c=0;l="";
}
if(p!=0){
    for(i=1;i<p;i++)
    output=output+str.charAt(j);
}
        return output;
   

    }
}

Input: "aaaaabrrr" Output: "a5br3" Input: "aaaaaaaaaabrrraaa" Output: "a10br3a3"

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