C++で禁止されている文字を削除する関数

Input: str = “ Hello: Welco*me/ to Tu>torials point|. ”
Output: “ Hello Welcome to Tutorials point. ”
Explanation: Input String contains forbidden characters which got removed and new string has no forbidden characters.

Input: str = “ How/ are y*ou doi,ng? ”
Output: “ How are you doing ”

#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
// function to remove forbidden charcters.
void removeforbidden(char* str){
    int j = 0;
    int n =  strlen(str);
    // traversing through the string and searching for forbidden characters.
    for(int i = 0;i<n;i++){
        switch(str[i]){
            case &#39;/&#39;:
            case &#39;\&#39;:
            case &#39;:&#39;:
            case &#39;?&#39;:
            case &#39;"&#39;:
            case &#39;<&#39;:
            case &#39;>&#39;:
            case &#39;|&#39;:
            case &#39;*&#39;:
            // inserting null value in place of forbidden characters.
            str[j] = &#39;\0&#39;;
            default:
            str[j++] = str[i];

        }
    }  
    // printing the string.
    for(int i = 0;i<n;i++)
        cout << str[i];
    return;
}
int main(){
    char str[] = "Hello: Welco*me/ to Tu>torial?s point|.";
    removeforbidden(str);
    return 0;
}

Hello, Welcome to Tutorials point.