C remove chars from string

Question

I have to write a function in C, which deletes all characters from string which are equal to entered character. For example user enters string "aabbccaabbcc" and char 'b' then the result should be "aaccaacc". I can't find mistake in my code (function does not delete all characters that should be deleted):

void removechar( char str[], char t )
{
  int i,j;
  for(i=0; i<strlen(str); i++)
  {
    if (str[i]==t) 
      for (j=i; j<strlen(str); j++)
      {
        str[j]=str[j+1];   
      } 
  }
}

Answer 1

When you delete one char (say at index = 5) at that index now correspond char that was at index = 6; but your for cycle increment to index = 6, so you skip new char at index = 5.
You'd better copy to a new string valid chars, it's easier.
Or you can try

void removechar( char str[], char t )
{
    int i,j;
    i = 0;
    while(i<strlen(str))
    {
        if (str[i]==t) 
        { 
            for (j=i; j<strlen(str); j++)
                str[j]=str[j+1];   
        } else i++;
    }
}

Answer 2

You can't remove chars from a string in this way. What you want to do is create a new string (char* array) and copy chars unless the char is t. in this case comtinue to the next char.