Super Reduced String HackerRank Solution ( Brute Force )

Super Reduced String 1.py

def superReducedString(s):
    currentstring=""
    nextstring=s
    while currentstring!=nextstring:    #Keep on doing this till there are no deletions,currentstring and nextstring would be same if there are no deletions
        currentstring=nextstring
        nextstring=""
        length,i=len(currentstring),0
        while i<length:
            if i<length-1:              #This if condition is necessary because if i is on last letter, accessing i+1 from string would result into IndexError
                if currentstring[i]==currentstring[i+1]:
                    i+=1            #Skipping characters if they are same
                else:
                    nextstring+=currentstring[i]    #Appending characters to nextstring if they are not same
            else:
                nextstring+=currentstring[i]        #Last letter cannot be checked so directly append it to nextstring
            i+=1
    if nextstring:          #If nextstring is not empty return it
        return nextstring
    return "Empty String"   #else return the string "Empty String"