Fix comments

datafusion/functions/src/string/initcap.rs

@@ -107,8 +107,9 @@ fn initcap_utf8view(args: &[ArrayRef]) -> Result<ArrayRef> {
 }
 
 fn initcap_string(string: Option<&str>) -> Option<String> {
+    let mut char_vector = Vec::<char>::new();
     string.map(|string: &str| {
-        let mut char_vector = Vec::<char>::new();
+        char_vector.clear();
         let mut previous_character_letter_or_number = false;
         for c in string.chars() {
             if previous_character_letter_or_number {

datafusion/sqllogictest/test_files/string_view.slt

@@ -427,6 +427,15 @@ logical_plan
 
 ### Initcap
 
+query TT
+EXPLAIN SELECT
+  INITCAP(column1_utf8view) as c
+FROM test;
+----
+logical_plan
+01)Projection: initcap(test.column1_utf8view) AS c
+02)--TableScan: test projection=[column1_utf8view]
+
 # Create a table with lowercase strings
 statement ok
 CREATE TABLE test_lowercase AS SELECT
@@ -621,15 +630,6 @@ logical_plan
 02)--Projection: CAST(test.column2_utf8view AS Utf8) AS __common_expr_1, test.column1_utf8view
 03)----TableScan: test projection=[column1_utf8view, column2_utf8view]
 
-query TT
-EXPLAIN SELECT
-  INITCAP(column1_utf8view) as c
-FROM test;
-----
-logical_plan
-01)Projection: initcap(test.column1_utf8view) AS c
-02)--TableScan: test projection=[column1_utf8view]
-
 ## Ensure no casts for LEVENSHTEIN
 ## TODO https://github.com/apache/datafusion/issues/11854
 query TT