Avoid Bus error: 10 during test cases [duplicate] - c

Question

This question already has answers here:
Why do I get a segmentation fault when writing to a "char *s" initialized with a string literal, but not "char s[]"?
(19 answers)
Why is this string reversal C code causing a segmentation fault? [duplicate]
(8 answers)
Closed 4 years ago.
I'm attempting to remove duplicate characters from a string without using any additional buffer. The code works when I declare a single variable like this
char s[] = "aaabbb";
but not when I'm attempting to loop through a few test cases.
#include <stdio.h>
#include <string.h>
/* Design an algorithm and write code to remove the duplicate characters in a string
without using any additional buffer. NOTE: One or two additional variables are fine.
An extra copy of the array is not. */
void removeDuplicates(char s[]) {
// attempts to modify array in place without extra buffer
}
int main() {
char *s[4] = {"aaaa", "abcd", "ababab", "aaabbb"};
int i;
for (i = 0; i < 6; i++) {
removeDuplicates(s[i]);
}
return 0;
}
This returns Bus error: 10 because it's attempting to modify the string literal "aaaa" but I'm not sure how to overcome this while maintaining a nice setup for the test cases.

Answer 1

The s[i] are pointing to string literals, you need a 2-dimensinal char array like this:
char s[][7] = {"aaaa", "abcd", "ababab", "aaabbb"}
Also note that for a string of length n you need at least n+1 spaces because of the '\0'-termination."aaabbb"` has length 6, so it need at least 7 spaces.
Then you can do
int main() {
char s[][7] = {"aaaa", "abcd", "ababab", "aaabbb"};
size_t i;
for (i = 0; i < sizeof s / sizeof s[0]; i++) {
removeDuplicates(s[i]);
}
return 0;
}