Convert Uppercase to Lowercase using Predefined Function in C

This program is a C program that takes a string as input from the user and converts it to lowercase.

The header file "stdio.h" is included, which contains the standard input/output library functions.
The "main()" function is defined as the starting point of the program.
A character array "a" with 100 elements is declared to store the string input by the user.
The "printf()" function is used to print the prompt "Enter the string:".
The "gets()" function is used to get the string input from the user.
The "strlwr()" function is used to convert the string stored in the "a" array to lowercase.
The "puts()" function is used to print the lowercase string.
The "return 0;" statement is used to indicate that the program executed successfully.

#include<stdio.h>
int main()
{
   char a[100];
   printf("\nEnter the string:");
   gets(a);
   strlwr(a);
   puts(a);
   return 0;
}

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Enter the string: TUTOR JOE'S 
tutor joe's