Conditional jump or moves depends on uninitialized values

Question

I am getting the following valerind error.

==9649== Conditional jump or move depends on uninitialised value(s)
==9649==    at 0x80493AD: check (dictionary.c:152)
==9649==    by 0x8048A6D: main (speller.c:119)
==9649==

Here is my code around dictionary.c:152. This is basically a string compare that takes into account capitalization.

for (spell = fletter[fletterc]; spell!= NULL; spell=spell->next)
{
    for (int j=0; spell->n[j] != '\0'; j++)
    {
        char letterx = spell->n[j];
        char lettery = word[j];
        if (letterx != lettery && letterx +('a'-'A') != lettery && letterx-('a'-'A') != lettery)
        {
            break;
        }
        else if (word[j+1] == '\0')
        {
            return true;
        }
    }
}

Answer 1

So I forgot to put the '/0' on all my dictionary words since I was using the fgetc and not fscanf, which caused some issues when I tried to compare the strings in my checker.