I want to remove current character and previous character in vector if it matches with the specified character. The code works for alphabetic characters like a, b, c. But if i want to remove multiple characters like *, the code gives segmentation fault. Any suggestions?

#include<iostream>
#include <vector>
#include<string>
using namespace std;

int main(){

vector<char> v;
vector<char>::iterator it;

string s= "abcdef*gh*i";


for(int i=0; i<s.size(); i++){
    v.push_back(s[i]);
    cout << v[i] <<" ";
}
cout <<"n";

for (it = v.begin(); it!= v.end(); it++)
{
    if(*it == '*'){
    v.erase(it);
    v.erase(it-1);
    }
}
for(int i=0; i< v.size(); i++)
    cout << v[i]<<" ";

return 0;
}

Result: Seg Fault