[wpiutil] Add remove_prefix() and remove_suffix() (#6118)

wpiutil/src/test/native/cpp/StringExtrasTest.cpp

@@ -0,0 +1,35 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include <gtest/gtest.h>
+
+#include "wpi/StringExtras.h"
+
+TEST(StringExtrasTest, RemovePrefix) {
+  std::string_view original = "wpilib";
+  auto modified = wpi::remove_prefix(original, "wpi");
+  EXPECT_EQ(original, "wpilib");
+  EXPECT_EQ(modified, std::optional{"lib"});
+}
+
+TEST(StringExtrasTest, RemoveSuffix) {
+  std::string_view original = "wpilib";
+  auto modified = wpi::remove_suffix(original, "lib");
+  EXPECT_EQ(original, "wpilib");
+  EXPECT_EQ(modified, std::optional{"wpi"});
+}
+
+TEST(StringExtrasTest, RemovePrefixNoMatch) {
+  std::string_view original = "wpilib";
+  auto modified = wpi::remove_prefix(original, "foo");
+  EXPECT_EQ(original, "wpilib");
+  EXPECT_EQ(modified, std::nullopt);
+}
+
+TEST(StringExtrasTest, RemoveSuffixNoMatch) {
+  std::string_view original = "wpilib";
+  auto modified = wpi::remove_suffix(original, "foo");
+  EXPECT_EQ(original, "wpilib");
+  EXPECT_EQ(modified, std::nullopt);
+}