[DGD] case conversion

[Robert Forshaw]

>From: Noah Gibbs <noah_gibbs at yahoo.com>
>   Rather than "ch[0] = str[count++]", you probably
>want something like "count++, ch = str[count..count]",
>which will set ch to be a one-character string
>containing str[count] as its only character.
>
>   Alternately, you could extract the character as an
>int to alter it, or alter it directly as str[count].

All good advice, however the runtime error is occuring on the comparison 
line:

if(ch[0] >= 'A' && ch[0] <= 'Z')

Any thoughts?

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