Fix formatting issues - remove trailing whitespace

Co-authored-by: hackwaly <[email protected]>

Author: Copilot

array/array_test.mbt

@@ -305,7 +305,6 @@ test "Array::join with Char" {
   let chars : Array[Char] = ['h', 'e', 'l', 'l', 'o']
   let result = chars.join("")
   inspect(result, content="hello")
-  
   let chars2 : Array[Char] = ['a', 'b', 'c']
   let result2 = chars2.join(", ")
   inspect(result2, content="a, b, c")

string/tostringview_char_demo_test.mbt

@@ -4,22 +4,22 @@ test "ToStringView for Char - comprehensive demo" {
   let chars1 : Array[Char] = ['h', 'e', 'l', 'l', 'o']
   let result1 = chars1.join("")
   inspect(result1, content="hello")
-  
+
   // Test 2: Join with separator
   let chars2 : Array[Char] = ['a', 'b', 'c', 'd']
   let result2 = chars2.join(", ")
   inspect(result2, content="a, b, c, d")
-  
+
   // Test 3: Empty array
   let chars3 : Array[Char] = []
   let result3 = chars3.join("-")
   inspect(result3, content="")
-  
+
   // Test 4: Single character
   let chars4 : Array[Char] = ['x']
   let result4 = chars4.join(" | ")
   inspect(result4, content="x")
-  
+
   // Test 5: Unicode characters
   let chars5 : Array[Char] = ['🌟', '✨', '🎉']
   let result5 = chars5.join(" ")