Replace char in string?? c++?

I am having trouble learning(distant learning) how to teach myself the algorithm to find and replace chars within a string. The program prompts the user to enter a string of chars, then the user is prompted again to enter the chars wished to be removed. I am trying to basically search and destroy and not making it past the search part. I am basically confusing myself. Anyway, I know that I am working with cstring and need to copy and move the char/chars to be removed but cannot figure out how. I am not asking for anyone to finish it so theres nothing left--just help me with the algorithm. I am new to c++, so excuse my lack of tags and messy code. I am only giving my code for the purpose of knowing what I am attempting to do, not to complete it. I have a few more things to add once I get this algorithm down.

# include <iostream>

# include <cstring>

using namespace std;

int main()

{

char str1[41];

char str2[21];

char ans;

int i;

cout<<"Please enter a string (40 characters max)-->";

cin.getline(str1, 40);

cout<<"Please enter the characters to be removed(20 characters max) -->";

cin.getline(str2, 20);

for(i=0;i!=str1[i];i++)

{

cout<<"First string with characters removed-->";

}

cout<<"Would you like to do another(y or n)?";

cin>>ans;

if(ans!='y'||ans!='Y')

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Replace char in string?? c++?

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