fix: resolve variable redeclaration error in capitalize function

Author: CatchingKiyoko

Sprint-2/1-key-errors/0.js

@@ -1,13 +1,25 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// I expect the code to possibly throw an error because str is being declared twice. once in the function and again in the function body declared as "let"
+// This function looks like its trying to turn the first letter of a string into a capital letter.
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+// after trying to run the code it produced a "SyntaxError: Identifier 'str' has already been declared"
 
 function capitalise(str) {
   let str = `${str[0].toUpperCase()}${str.slice(1)}`;
   return str;
 }
-
+console.log(capitalise("hello"));
 // =============> write your explanation here
+// this is because the variable str is declared twice, once in the function parameters and again inside the function body with "let str"
+// str is declared as a parameter, so we don't need to declare it again with let you can just use it directly.
+// to fix the error, we can remove the "let" keyword from the second declaration of str.
 // =============> write your new code here
+
+function capitalize(str) {
+  str = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return str;
+}
+console.log(capitalize("the first letter should be capitalized"));