C/C++ C++: Replacing Characters in A String

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To replace spaces in a 2-character string in C++, check each character of the string for a space. If the 0th character is a space, assign '_' to it; repeat this for the 1st character. The sample program initializes a string called passCode and outputs the modified string. Users are encouraged to implement the character checks and replacements in the provided code section. This approach effectively transforms spaces into underscores in the specified string.
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Replace any space ' ' by '_' in 2-character string passCode.

Sample program:

Code:
#include 
#include 
#include 
using namespace std;

int main() {
   string passCode;

   passCode = "1 ";
   
<student code>

   

   cout << passCode << endl;
   return 0;
}

I'm super lost on this. I could definitely use some help/hints. Thanks.
 
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Check if the 0th character is a space. If so, assign [m]'_'[/m] to it. Do the same with the 1st character.
 
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