Find and replace words in clean C program?

Searching and replacing words or substrings in text is not necessarily simple or difficult in C!

1. Search and Replace in a C Program:
2. Tips for Searching and Replacing Words or Substrings in Text:

1.) Search and Replace in a C Program:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

// Function to search and replace substrings
void searchAndReplace(char *source, char *search, char *replace, char *result) {
  int i, j, k;
  int sourceLength = strlen(source);
  int searchLength = strlen(search);
  int replaceLength = strlen(replace);

  char* sourceCopy = source;  // Copy of the source string
  char* searchCopy = search;  // Copy of the search string

  for (i = 0, j = 0; i < sourceLength; ) {
      if (sourceCopy[i] == searchCopy[0]) {
          // Check if the substring matches
          int match = 1;
          for (k = 1; k < searchLength; k++) {
              if (sourceCopy[i + k] != searchCopy[k]) {
                  match = 0;
                  break;
              }
          }
          if (match) {
              // Substring found, replace it
              for (k = 0; k < replaceLength; k++) {
                  result[j++] = replace[k];
              }
              i += searchLength;
          } else {
              // No match, copy and continue
              result[j++] = sourceCopy[i++];
          }
      } else {
          // No match, copy and continue
          result[j++] = sourceCopy[i++];
      }
  }

  result[j] = "\0"; // Null-terminate the result
}

int main() {
  char *source = "Hello World! Hello, Universe!";
  char *search = "Hello";
  char *replace = "Hi";

  char result[100]; // Assumption: Result fits in the buffer

  searchAndReplace(source, search, replace, result);

  printf("Original: %s\n", source);
  printf("Replaced: %s\n", result);

  printf("Waiting for a key press.\n");

  // Wait for key press (Windows-specific)
  _getch();

  return 0;
}

2.) Tips for Searching and Replacing Words or Substrings in Text: