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#ifndef REPLACE_H
#define REPLACE_H
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* replace needle with noodle, returns a char* you should free afterward. */
char* replace(char* haystack, char* needle, char* noodle) {
int wlen = strlen(haystack) + strlen(noodle);
char* loc = strstr(haystack, needle);
if (loc == NULL)
return NULL;
int start_pt = strlen(haystack) - strlen(loc);
char* post = malloc(wlen*sizeof(char));
strcpy(post, &haystack[start_pt + strlen(needle)]);
char* pre = malloc(wlen*sizeof(char));
strncpy(pre, haystack, start_pt);
char* ans = malloc(wlen*sizeof(char));
strcat(ans, pre);
strcat(ans, noodle);
strcat(ans, post);
free(pre);
free(post);
return ans;
}
#endif
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