fix(test): replace std::printCharLine with std::print in stringCharAt tests

Author: LindonAliu

test/functional/run/string_test.glu

@@ -869,71 +869,71 @@ func test_stringCharAt() -> Void {
     // Basic character access
     var str1: String = "hello";
     var result1: Char = str1[0];
-    std::printCharLine(result1); // CHECK: h
+    std::print(result1); // CHECK: h
 
     // Access middle character
     var str2: String = "hello";
     var result2: Char = str2[2];
-    std::printCharLine(result2); // CHECK: l
+    std::print(result2); // CHECK: l
 
     // Access last character
     var str3: String = "hello";
     var result3: Char = str3[4];
-    std::printCharLine(result3); // CHECK: o
+    std::print(result3); // CHECK: o
 
     // Access character with spaces
     var str4: String = "hello world";
     var result4: Char = str4[5];
-    std::printCharLine(result4); // CHECK: {{^ $}}
+    std::print(result4); // CHECK: {{^ $}}
 
     // Access number character
     var str5: String = "hello123";
     var result5: Char = str5[5];
-    std::printCharLine(result5); // CHECK: 1
+    std::print(result5); // CHECK: 1
 
     // Access symbol character
     var str6: String = "hello!@#";
     var result6: Char = str6[5];
-    std::printCharLine(result6); // CHECK: !
+    std::print(result6); // CHECK: !
 
     // Single character string
     var str11: String = "a";
     var result11: Char = str11[0];
-    std::printCharLine(result11); // CHECK: a
+    std::print(result11); // CHECK: a
 
     // Mixed case access
     var str12: String = "AbCdEf";
     var result12: Char = str12[1];
-    std::printCharLine(result12); // CHECK: b
+    std::print(result12); // CHECK: b
 
     // Additstdnal comprehensive test cases
     var str13: String = "programming";
     var result13: Char = str13[0];
-    std::printCharLine(result13); // CHECK: p
+    std::print(result13); // CHECK: p
 
     var str14: String = "abcdefghijk";
     var result14: Char = str14[5];
-    std::printCharLine(result14); // CHECK: f
+    std::print(result14); // CHECK: f
 
     var str15: String = "123456789";
     var result15: Char = str15[4];
-    std::printCharLine(result15); // CHECK: 5
+    std::print(result15); // CHECK: 5
 
     var str16: String = "special!@#$%";
     var result16: Char = str16[7];
-    std::printCharLine(result16); // CHECK: !
+    std::print(result16); // CHECK: !
 
     var str17: String = "UPPERCASE";
     var result17: Char = str17[2];
-    std::printCharLine(result17); // CHECK: P
+    std::print(result17); // CHECK: P
 
     var str18: String = "lowercase";
     var result18: Char = str18[3];
-    std::printCharLine(result18); // CHECK: e
+    std::print(result18); // CHECK: e
 
     var str19: String = "MixedCase";
     var result19: Char = str19[5];
-    std::printCharLine(result19); // CHECK: C
+    std::print(result19); // CHECK: C
 
     var str20: String = "tab\ttab";
     var result20: Char = str20[3];
@@ -945,11 +945,11 @@ func test_stringCharAt() -> Void {
 
     var str22: String = "boundary_test";
     var result22: Char = str22[12];
-    std::printCharLine(result22); // CHECK: t
+    std::print(result22); // CHECK: t
 
     var str23: String = "first_last";
     var result23: Char = str23[9];
-    std::printCharLine(result23); // CHECK: t
+    std::print(result23); // CHECK: t
 }
 
 func test_stringSubstring() -> Void {