Get Non-Repeating Character From String

1#include <stdio.h>
2#include <string.h>
3
4char firstNonRepeating(char str[]) {
5    int count[256] = {0};
6    
7    // Count frequency
8    for (int i = 0; str[i]; i++) {
9        count[(int)str[i]]++;
10    }
11    
12    // Find first with count 1
13    for (int i = 0; str[i]; i++) {
14        if (count[(int)str[i]] == 1) {
15            return str[i];
16        }
17    }
18    
19    return '\0';  // No non-repeating char
20}
21
22int main() {
23    char str[] = "geeksforgeeks";
24    
25    char result = firstNonRepeating(str);
26    
27    printf("String: %s\n", str);
28    
29    if (result != '\0') {
30        printf("First non-repeating character: '%c'\n", result);
31    } else {
32        printf("No non-repeating character found\n");
33    }
34    
35    return 0;
36}