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#include <stdio.h>
#include<string.h>
void reverse();
void revchars(char arr[]);
void reverse()
{
   char arr[100];
   printf("Enter a string to reverse\n");
   gets(arr);
   revchars(arr);
}
void revchars(char arr[])
{
	strrev(arr);
 
   printf("Reverse of the string is \n%s\n", arr);
 
}
int main() {
	reverse();
	return 0;
}

prog.c: In function ‘reverse’:
prog.c:9:4: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
    gets(arr);
    ^~~~
prog.c: In function ‘revchars’:
prog.c:14:2: warning: implicit declaration of function ‘strrev’ [-Wimplicit-function-declaration]
  strrev(arr);
  ^~~~~~
/home/PEeIjU/ccN1CjKG.o: In function `reverse':
prog.c:(.text+0x17): warning: the `gets' function is dangerous and should not be used.
prog.c:(.text+0x21): undefined reference to `strrev'
/home/PEeIjU/ccN1CjKG.o: In function `revchars':
prog.c:(.text+0x47): undefined reference to `strrev'
collect2: error: ld returned 1 exit status

Standard output is empty