src/main/java/com/github/fge/grappa/support/StringBuilderVar.java
public boolean append(final char c)
    {
        if (get() == null)
            return set(new StringBuilder().append(c));
        get().append(c);
        return true;
    }
public boolean append(final char c)
    {
        if (get() == null)
            return set(new StringBuilder().append(c));
        get().append(c);
        return true;
    }
Appends the given char.
If this instance is currently uninitialized the given char is used for initialization.

@param c the char to append
@return true