C program to print lowercase characters in a string using recursion

Write a C program to print lowercase characters in a string using recursion.

  #include <stdio.h>
  #include <string.h>

  /* print lowercase character in give character using recursion */
  void printLower(char *str) {
        if (*str != '\0') {
                /* prints lowercase characters alone */
                if (*str >= 'a' && *str <= 'z') {
                        printf("%c", *str);
                }

                printLower(str + 1);
        }
        return;
  }

  int main() {
        char str[256];

        /* get the input string from the user */
        printf("Enter your input string:");
        fgets(str, 256, stdin);
        str[strlen(str) - 1] = '\0';

        /* prints lowercase character in the given input */
        printf("Lower case characters in given string:");
        printLower(str);
        printf("\n");
        return 0;
  }

  Output:

  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input string:HeLlO WoRlD
  Lower case characters in given string: elol