C++ を使用して文字列から指定された単語を削除する

Input : str = “remove a given word ”, word = “ remove ”
Output : “ a given word ”

Input : str = “ god is everywhere ”, word = “ is ”
Output : “ god everywhere ”

#include <bits/stdc++.h>
using namespace std;
int remove_word (string str, char word[]) {
   char matrix[10][30];
   int i = 0, j = 0, k = 0, len1 = 0, len2 = 0;

   // putting each word of string into the rows of the 2-D matrix.
   for (i = 0; str[i] != &#39;\0&#39;; i++) {
      if (str[i] == &#39; &#39;) {
         matrix[k][j] = &#39;\0&#39;;
         k++;
         j = 0;
      }else{
         matrix[k][j] = str[i];
         j++;
      }
   }
   // looking for the word in a given string and putting a null character when the word is found.
   matrix[k][j] = &#39;\0&#39;;
   j = 0;
   for (i = 0; i < k + 1; i++) {
      if (strcmp (matrix[i], word) == 0) {
         matrix[i][j] = &#39;\0&#39;;
      }
   }

   j = 0;
   // printing the reordered string.
   for (i = 0; i < k + 1; i++){
      if (matrix[i][j] == &#39;\0&#39;)
         continue;
      else
         cout << matrix[i] << " ";
   }

   cout << "\n";
}

int main () {
   char str1[] = "remove a given word", word1[] = "remove";
   char str2[] = "god is everywhere", word2[]="is";
   // calling a function to remove a word from a string and print it.
   remove_word (str1, word1);
   remove_word (str2, word2);

   return 0;
}

a given word
god everywhere