#include<string.h>
#include<stdio.h>
int main(){
  char *p;
  char s[20],s1[1];
  printf("\nEnter a string: ");
  scanf("%[^\n]",s);
  fflush(stdin);
  printf("\nEnter character: ");
  gets(s1);
  p=strpbrk(s,s1);
  printf("\nThe string from the given character is: %s",p);
  return 0;
}

#include<stdio.h>
#include<string.h>
int main(){
    char str[50];
    char *rev;
    printf("Enter any string : ");
    scanf("%s",str);
    rev = strrev(str);
   
    printf("Reverse string is : %s",rev);
   
    return 0;
}

#include<stdio.h>
int main(){
    char str[50];
    char rev[50];
    int i=-1,j=0;

    printf("Enter any string : ");
    scanf("%s",str);
   
    while(str[++i]!='\0');

    while(i>=0)
     rev[j++] = str[--i];

    rev[j]='\0';
  
    printf("Reverse of string is : %s",rev);
  
    return 0;
}
Sample output:
Enter any string : cquestionbank.blogspot.com
Reverse of string is : moc.topsgolb.knabnoitseuqc

#include<stdio.h>
int main(){
    char str[50];
    char rev[50];
    char *sptr = str;
    char *rptr = rev;
    int i=-1;

    printf("Enter any string : ");
    scanf("%s",str);
   
    while(*sptr){
     sptr++;
     i++;
    }

    while(i>=0){
     sptr--;
     *rptr = *sptr;
     rptr++;
     --i;
    }

    *rptr='\0';
  
    printf("Reverse of string is : %s",rev);
  
    return 0;
}
Sample output:
Enter any string : Pointer
Reverse of string is : retnioP

#include<stdio.h>
#define MAX 100
char* getReverse(char[]);

int main(){

    char str[MAX],*rev;

    printf("Enter  any string: ");
    scanf("%s",str);

    rev = getReverse(str);

    printf("Reversed string is: %s",rev);
    return 0;
}

char* getReverse(char str[]){

    static int i=0;
    static char rev[MAX];

    if(*str){
         getReverse(str+1);
         rev[i++] = *str;
    }

    return rev;
}
Sample output:
Enter any string: mona
Reversed string is: anom