Thread: function that modifies a string

i have to write a small funtion that modifes a string by replacing every occurence of the letters foo by aaa. an example of the string is "food fool" and should become "aaad aaal". i've written this function and i just want to know if i got it right because i'm not that good when it comes to functions. thanks

Code:

void censor(char s[])
{ 
   int i; 
   for(i=0; s[i]!='\0'; i++)
      if (s[i]=='f' && s[i+1]=='o' && s[i+2]=='o')
      s[i]=s[i+1]=s[i+2]='a';
   return a; 
}