SMS Language

SMS language or textese (also known as txt-speak, txtese, chatspeak, txt, txtspk, txtk, txto, texting language, txt lingo, SMSish, txtslang,or txt talk) is a term for the abbreviations and slang commonly used with mobile phone text messaging. 

 Some of the abbreviations used are

• s for yes
• u for you
• 2day for today
• y for why

Many grandpa's have started sending SMSes to their grand children. But they are not familiar with the SMS lingo. 

Can you help them by writing a program that would convert a given text in proper English to SMS lingo? Consider only the 4 words listed above. 

Input Format: 

Input consists of a single string. Assume that the maximum length of the string is 200 and all letters are in lower-case. 

Output Format: 

Output consists of a single string. 

Sample Input 1: 

where were you yesterday? 

Sample Output 1: 

where were u yesterday? 

Sample Input 2: 

why is today a working day for you? 

Sample Output 2: 

y is 2day a working day for u?

Code:

  #include<stdio.h>
#include<string.h>
void replace(char *);
int main(){
  char s1[100];
  gets (s1);
  replace(s1);
  printf("\n%s",s1);
  return 0;
}
void replace(char *s1)
{
  char r[4][10]={"yes","you","today","why"};
    char rep[4][5]={"s","u","2day","y"};
      char buff[500];
  int i;
  char *ch;
  for(i=0;i<4;i++)
    if((ch=strstr(s1,r[i]))){
      strncpy(buff,s1,ch-s1);
      buff[ch-s1]=0;
      sprintf(buff+(ch - s1),"%s%s",rep[i],ch+strlen(r[i]));
      s1[0]=0;
      strcpy(s1,buff);
      return replace (s1);
    }
}