strset(): setting chars of a string

#include<stdio.h>
#include<string.h>
int main()
{
   char str1[20] = "plus2net";
   char str2='*';
   printf("Original string : %s \n", str1);
   strset(str1,str2);
   printf("After  strset() : %s",str1);
   return 0;
}

Original string :plus2net
After strset() : ********

strset(main_string, set_string);

Example: Custom Implementation of strset()

#include <stdio.h>

void custom_strset(char *str, char ch) {
    while (*str) {
        *str = ch;
        str++;
    }
}

int main() {
    char str[] = "Hello World!";
    custom_strset(str, '*');
    printf("Modified string: %s\n", str);  // Output: *************
    return 0;
}

Example: Handling Edge Cases (Null or Empty String)

#include <stdio.h>

void custom_strset(char *str, char ch) {
    if (str == NULL) {
        printf("String is NULL\n");
        return;
    }
    while (*str) {
        *str = ch;
        str++;
    }
}

int main() {
    char *str = NULL;
    custom_strset(str, '*');  // Output: String is NULL

    char empty[] = "";
    custom_strset(empty, '*');
    printf("Modified empty string: %s\n", empty);  // Output: (empty)
    return 0;
}

Example: Replacing Special Characters in String

#include <stdio.h>

void custom_strset(char *str, char ch) {
    while (*str) {
        *str = ch;
        str++;
    }
}

int main() {
    char str[] = "Hello, World! 123";
    custom_strset(str, '#');
    printf("Modified string: %s\n", str);  // Output: ###############
    return 0;
}