C++ Remove duplicate characters

Exercise 1

Enter a string, remove consecutive duplicate characters

Example:

Enter a string: ohhello
After removing consecutive duplicate characters: ohelo

Base code:

#include <iostream>
#include <string>
using namespace std;
int main() {
	string str;
	int i, j;
	cout << "Enter a string: ";
	cin >> str;
	
	for (i = 0; i < str.length(); i++) {
		// check if str[i] is same as str[i+1]
		// if same, remove str[i+1] by shifting all characters to the left


	}
	
}

Exercise 2

Use function to remove all duplicate characters from a string

Example:

Enter a string: ohhello
Unique characters: ohelo

Base code:

#include <iostream>
#include <string>
using namespace std;
int main() {
	string str;
	int i, j, k;
	cout << "Enter a string: ";
	cin >> str;
	
	for (i = 0; i < str.length(); i++) {
		// for each characters

		for (j = i + 1; j < str.length(); j++) {
			// check the rest of the characters if same as str[i]
			// if same, remove str[j] by shifting all characters to the left



		}
	}
}