write a program to hide a string into other string.

#include<stdio.h>
#include<string.h>
main()
{
int i,j;
char str[100],str1[10];
char *ptr;
puts("enter two strings:\n");
gets(str);
gets(str1);
ptr=str;
while(ptr=strstr(ptr,str1))
{
strcpy(ptr,ptr+strlen(str1));
ptr++;
}
puts(str);
}

write a program to sort alphabet in a string.

#include<stdio.h>
#include<string.h>
main()
{
int i,j;
char str[100],temp=0;
puts("Enter a string:\n");
gets(str);
puts(str);
for(i=0;i<strlen(str);i++)
{
for(j=i+1;j<strlen(str);j++)
{
if(str[i]>str[j])
{
temp=str[i];
str[i]=str[j];
str[j]=temp;
}
}
}
puts(str);
}

write a program to remove extra character from given string.

#include<stdio.h>

#include<string.h>

main()

{

int i,j;

char temp,str[100];

puts("Enter a string:\n");

gets(str);

for(i=0;str[i];i++)

{

for(j=i+1;str[j];j++)

{

if(str[i]==str[j])

{

strcpy(str+j,str+j+1);

j--;

}

}

}

puts(str);

}