- #include <stdio.h>
- #include <string.h>
-
- void custom_replace(char *str, const char *find, const char *replace) {
- int find_len = strlen(find);
- int replace_len = strlen(replace);
- int str_len = strlen(str);
-
- for (int i = 0; i <= str_len - find_len; i++) {
- int j;
- for (j = 0; j < find_len; j++) {
- if (str[i + j] != find[j]) {
- break;
- }
- }
- if (j == find_len) {
- memmove(str + i + replace_len, str + i + find_len, str_len - i - find_len + 1);
- memcpy(str + i, replace, replace_len);
- str_len = str_len - find_len + replace_len;
- }
- }
- }
-
- int main() {
- char str[] = "Hello, world! This is a test.";
- const char *find = "world";
- const char *replace = "universe";
-
- custom_replace(str, find, replace);
-
- printf("Modified string: %s\n", str);
-
- return 0;
- }
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