Char vs. Nat32 - I'm not getting it

[BlazingFuddle]

Hi,

I am stuck on question 5, and am not getting Candid not having a Char character. Here is what I have done (not looking for perfect; just working!)

public func capitalize_text (t : Text ) : async Text {
var myreturntext:Text="";
for(char in t.chars()) {
var myinterimnat32=Char.toNat32(char);
myinterimnat32+=32;
let myinterimchar:Char=Char.fromNat32(myinterimnat32);
myreturntext#=Char.toText(myinterimchar);
};
return myreturntext;
};

This "compliles" fine, but I then attempt to call it with:
dfx canister call day_2 capitalize_character '("this is my text")'
and receive:
Invalid data: Unable to serialize Candid values: type mismatch: "this is my text" cannot be of type nat32

I know this is to do with Candid Char vs. Nat32 but just don't understand how to progress. Tips appreciated.

Thanks,

[professionalGithub99]

It looks like youre calling another function? Here you have capitilize_text

The function you call is dfx canister call day_2 capitalize_character '("this is my text")'

capitilize_text vs capitilize_character function.