fix for failing tests

Author: vkverma9534

pandas/core/arrays/_arrow_string_mixins.py

@@ -202,13 +202,17 @@ def _str_title(self) -> Self:
     def _str_swapcase(self) -> Self:
         return self._from_pyarrow_array(pc.utf8_swapcase(self._pa_array))
 def _str_removeprefix(self, prefix: str):
+    if prefix == "":
+        return self
     starts_with = pc.starts_with(self._pa_array, pattern=prefix)
     removed = pc.utf8_slice_codeunits(self._pa_array, len(prefix))
     result = pc.if_else(starts_with, removed, self._pa_array)
     return self._from_pyarrow_array(result)
 
 
 def _str_removesuffix(self, suffix: str):
+    if suffix == "":
+        return self
     ends_with = pc.ends_with(self._pa_array, pattern=suffix)
     removed = pc.utf8_slice_codeunits(self._pa_array, 0, stop=-len(suffix))
     result = pc.if_else(ends_with, removed, self._pa_array)
@@ -217,6 +221,7 @@ def _str_removesuffix(self, suffix: str):
 
 
 
+
     def _str_startswith(
         self, pat: str | tuple[str, ...], na: Scalar | lib.NoDefault = lib.no_default
     ):