C program to Locate a word in String - STRSTR

Below is C program to Locate a word in String - STRSTR.

Program:

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/* Locate a word in String - STRSTR */   #include<stdio.h>   int main() {  char str1[100], str2[100];  int i,j,k;  printf("Please enter first string: ");  // gets(str1);  // fgets is a better option over gets to read multiword string .  fgets(str1, 100, stdin);  // Following can be added for extra precaution for '\n' character  // if(str1[length(str1)-1] == '\n') str1[strlen(str1)-1]=NULL;    printf("Please enter a word: ");  // gets(str2);  fgets(str2, 100, stdin);  // if(str2[length(str2)-1] == '\n') str2[strlen(str2)-1]=NULL;     for(i=0;str1[i]!=NULL;i++)  {   for(k=i,j=0;str2[j]!=NULL;j++,k++)    if(str1[k]!=str2[j])     break;   if(str2[j]==NULL)   {    printf("\"%s\" is the sub string of \"%s\" at %d location",str2,str1,k+1);    i=-1;    break;   }  }  if(i!=-1)   printf("\"%s\" is not the sub string of \"%s\"",str2,str1);    return 0; }