Not able to pass all Test cases(One test case showing wrong ans)

#1

#include
using namespace std;
long long int reverse(long long int n){
long long int sum=0;
while(n!=0){
sum=sum10+n%10;
n=n/10;
}
return sum;
}
long long int replace(long long int n){
long long int sum=0,num=0;
if(n==0)
return 0;
while(n!=0){
num=n%10;
if(num==0){
num=5;
}
sum=sum10+num;
n=n/10;
}
return reverse(sum);
}
int main() {
long long int n;
cin>>n;
cout<<replace(n);
return 0;
}

#2

if n is 0 you have to return 5
not 0
change this

all testcase will passed

#3

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