Run test for string

Author: namannimmo10

integration_tests/run_tests.py

@@ -23,6 +23,7 @@
     "test_builtin_int.py",
     "test_builtin_len.py",
     "test_builtin_float.py",
+    "test_builtin_str_02.py",
     "test_builtin_round.py",
     "test_math1.py",
     "test_math_02.py",